Yup, I noticed that too on the PS4, the icons disappearing when using the Upgradeable filter. It is a minor display bug.
I consider the "Upgrade a kingdom" when everything's maxed, or "Upgrade a troop to level 15" when you are VIP lvl.11 "First world problem bugs". It's a bit annoying, but hey, it's the first task, ot gets replaced, and it could have been something like "do 8 battles with 3 troops of Khaziel" which only gives 2000 gold (which can easily be earned by a single PvP battle).
I hope that they release a bugfix-hotfix that fixes the store, because I am someone who always has the "there is no content" error, which prevents me from spending real money, but since PS4 hotfix 1.13, it results in my store disabling all buttons, so I can't buy glory packs anymore
Luckily the support is very good; I made a ticket, asking to reduce my glory and "buy" a set of glory packs, so I did get my Bonnie Rose to mythic, AND get enough event keys to get a Kraken.
But I have to admit, the game without any store functionality, especially the glory packs, is not that nice at the moment...