Hello ,
I made a circle shape , i made a thin vertical mask with no problem , put keyframe , after couple frames i rotate this mask to make it horizontal line , i previewed it , the problem appeared , while the mask was rotating , the mask became smaller and shorter until the mask became in 45 degrees , after that the mask became bigger and longer until the mask became to the original size and 100% horizontal ,
i'm sorry for my bad English
if you didn't understand me , watch this video and i think you'll understand :
How to solve this problem ? i din't want this mask to become smaller , i want it still the same size