[2021] Banishing Light and Planeswalkers.. is this a bug or mechanic?

Theres a mechanic that i'm not understanding and i'm hoping someone can explain it to me. With the deck i've been using I have multiple planeswalkers, when removed from the battlefield by a banishing light, if i destroy the banishing light with either planar cleansing or ruinous ultimatum, it seems that when the planeswalkers return to the battlefield they do so with double the normal amount of loyalty counters. For example, in the game i was just playing I had 3 planeswalkers captured by banishing lights and after a planar cleansing EACH of them had 10, 12 and 12 loyalty counters (vivian, ugin and chandra).

I dont fully understand what is causing this. It happens every game I play that has a banishing light card. Is this a bug? or is there something about how banishing light works?

I should note that if i destroy a banishing light by other means besides a "destroy all nonland permanents" card it does not seem to have this effect

thanks!

EDIT* No i do not have vorinclex or any other cards that modify counters