So people, now including myself have recently experienced a bug with the icons.
All of them are gone!
Similarly to what happened to me (at least, idk about anyone else) with emotes and rune pages, every icon I bought is gone.
I had somewhere around 130 icons, and now they have been reduced to 37 (i just bought a few, not realizing everything was gone).
I'd rather not think that everything is gone (including all the borders with the icons), so I'll leave you there.
I don't know if only a few people are experiencing this...
If you experienced this, please answer on the poll.