particular character gets replaced in saved teams and after changing screens

y4747

strange bug on steam:
i have a saved team: 3* thanos, character A, character B. when i load it, it actually loads 2* wolvie, A, B.

if i manually switch to thanos he's there and i can start a fight with him, but if i:

-go into any character info and back out
-back out of the fight selection screen and the open it again

he turns into wolvie again.

other thanos's (thanosi? 5*, 4*, 3 ascended to 4) work fine. other characters work fine (haven't checked every single character, obviously, but at least a dozen others).
just 3* thanos (each of my 3 dupes for him).
the only way to use him is select manually and then choose fight without any intervening steps.