http://i.imgur.com/NOEqZwY.jpg
My Achlyophage Symbiote is upgraded, has been for a few weeks now, but it does not have the yellow border surrounding it. Not a huge issue, no, it just sort of bothers me.
I also just noticed it was doing it with both my Crest of the Alpha Lupi and Lucky Raspberry also.
http://i.imgur.com/fwbqasI.jpg
http://i.imgur.com/e7tmDMz.jpg
Edit: Should be noted that it appears fine In-game. The issue is only on Bungie.net, the mobile app, and third party sites like Destiny Item manager, and Destinytracker
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You need to ascend them first before there fully upgraded