Maltego desktop client version 4.2.0 released on 06 Feb 2019 had a bug in which some of the entities on the graph displays entity name property instead of entity display value in graph. See example screenshot below:
An update v4.2.1 was released on 12 Feb 2019 that fixes this issue.
Manual Fix
If you have upgraded to v4.2.1 from any lower version and still face this issue, please remove the impacted entities by going to Entities Tab > Manage Entities and click on red cross button at the end of the row. After doing this, go to Transform Hub and reinstall/refresh the hub items in which the impacted entity belongs to.
List of impacted entities in v4.2.0
maltego.askfm.profile maltego.badoo.profile maltego.bitbucket.profile maltego.blogger.profile maltego.classmates.profile maltego.cryptocurrency.ethereum.address maltego.cryptocurrency.ethereum.token maltego.CryptocurrencyWallet maltego.delicious.profile maltego.disqus.profile maltego.EmailAddress.person maltego.facebook.album maltego.facebook.event maltego.facebook.group maltego.facebook.mutual.friends maltego.facebook.page maltego.facebook.place maltego.facebook.profile maltego.flickr.profile maltego.foursquare.profile maltego.gravatar.profile maltego.indeed.profile maltego.instagram.profile maltego.lanyrd.profile maltego.linkedin.company maltego.linkedin.education maltego.linkedin.group maltego.linkedin.profile maltego.livejournal.profile maltego.mymail.profile maltego.myspace.profile maltego.ok.profile maltego.pinterest.profile maltego.place maltego.plus.google.profile maltego.pof.profile maltego.quora.profile maltego.reddit.profile maltego.skype maltego.snapchat.snap maltego.stumbleupon.profile maltego.tagged.profile maltego.tinder.profile maltego.tumblr.profile maltego.vimeo.profile maltego.vine.profile maltego.vk.album maltego.vk.group maltego.vk.page maltego.vk.profile maltego.xing.company maltego.xing.profile maltego.youtube.channel maltego.youtube maltego.youtube.video shadowdragon.amazon.comment shadowdragon.amazon.product shadowdragon.amazon.review shadowdragon.amazon.user shadowdragon.amazon.wishlist shadowdragon.ameba.user shadowdragon.babycenter.group shadowdragon.babycenter.photo shadowdragon.babycenter.user shadowdragon.bing.result shadowdragon.bitchute.channel shadowdragon.bitchute.user shadowdragon.bitchute.video shadowdragon.blackplanet.user shadowdragon.blogger.user shadowdragon.bustedmugshots.mugshot shadowdragon.buzznet.user shadowdragon.cocolog.user shadowdragon.companieshouse.appointment shadowdragon.companieshouse.company shadowdragon.companieshouse.officer shadowdragon.crunchbase.user shadowdragon.dailymotion.channel shadowdragon.dailymotion.comment shadowdragon.dailymotion.playlist shadowdragon.dailymotion.user shadowdragon.dailymotion.video shadowdragon.deviantart.user shadowdragon.ebay.user shadowdragon.etsy.user shadowdragon.fb.album shadowdragon.fb.app shadowdragon.fb.comment shadowdragon.fb.doc shadowdragon.fb.event shadowdragon.fb.group shadowdragon.fb.milestone shadowdragon.fb.note shadowdragon.fb.page shadowdragon.fb.playlist shadowdragon.fb.post shadowdragon.fb.review shadowdragon.fb.user shadowdragon.flickr.group shadowdragon.flickr.user shadowdragon.foursquare.item shadowdragon.foursquare.list shadowdragon.foursquare.place shadowdragon.foursquare.special shadowdragon.foursquare.tip shadowdragon.foursquare.user shadowdragon.gab.post shadowdragon.gab.user shadowdragon.github.user shadowdragon.goo.user shadowdragon.google.result shadowdragon.googleplus.user shadowdragon.gravatar.user shadowdragon.hatena.user shadowdragon.icq.user shadowdragon.imageshack.user shadowdragon.imgur.user shadowdragon.imvu.user shadowdragon.instagram.comment shadowdragon.instagram.post shadowdragon.instagram.tag shadowdragon.instagram.user shadowdragon.instructables.comment shadowdragon.instructables.group shadowdragon.instructables.instructable shadowdragon.instructables.orangeboard-comment shadowdragon.instructables.patch shadowdragon.instructables.user shadowdragon.jugem.user shadowdragon.kik.user shadowdragon.linkedin.user shadowdragon.livejournal.user shadowdragon.mailru.user shadowdragon.menuism.user shadowdragon.mewe.user shadowdragon.myspace.user shadowdragon.naijapals.user shadowdragon.okcupid.user shadowdragon.okru.user shadowdragon.pandora.user shadowdragon.pastebin.paste shadowdragon.pastebin.user shadowdragon.pgp.user shadowdragon.photobucket.user shadowdragon.pinterest.user shadowdragon.plurk.user shadowdragon.pof.user shadowdragon.pornhub.user shadowdragon.qq.album shadowdragon.qq.comment shadowdragon.qq.log shadowdragon.qq.messageboard-comment shadowdragon.qq.post shadowdragon.qq.user shadowdragon.reddit.user shadowdragon.reverbnation.artist shadowdragon.reverbnation.fan shadowdragon.reverbnation.label shadowdragon.reverbnation.place shadowdragon.seesaa.user shadowdragon.skype.user shadowdragon.soundcloud.user shadowdragon.sourceforge.user shadowdragon.spotify.user shadowdragon.sprashivai.user shadowdragon.steam.comment shadowdragon.steam.group shadowdragon.steam.user shadowdragon.sudani.user shadowdragon.telegram.user shadowdragon.tinder.user shadowdragon.tripadvisor.user shadowdragon.tumblr.user shadowdragon.uplike.user shadowdragon.vimeo.user shadowdragon.vine.user shadowdragon.virustotal.user shadowdragon.vk.group shadowdragon.vk.user shadowdragon.voat.user shadowdragon.weibo.user shadowdragon.xing.group shadowdragon.xing.user shadowdragon.yahoo.result shadowdragon.yelp.user shadowdragon.youtube.user shadowdragon.zillow.user