Issue while using signature stones

D٨RK_ANG3L

From the inventory if the signature stones are used, all the champs are listed which is expected. But if you max sig a champion the champ doesn’t disappear. The champ is still listed which is not an expected behavior

SummonerNR

The Sig Stone champ list screen is bugged as of late.
It sort of “locks” the champ list. Doesn’t update the Sig level of the one you just did (so thus also apparently not removing the champ when hit Max either).
Doesn’t allow scrolling of the champ list anymore after applying some.
Etc.

In the past, when it was working, it did indeed remove a champ that you took to Max.

And on your other Rank-Up Gem post, it may just be taking you to the normal Champs screen, not a dedicated filtered list like with applying Sig Stones or Awakening Gems.