Animate 2020 prolongates some layers while I am writing on one active layer

Hello, so i am working on animate 2020, and sometimes once I am transforming (Q or Ctrl + T) on the active layer, animate takes some underneath layers and write on it, hence some drawings are copying in the same frames of the timeline than my current layer and I always have to cut and delete these extensions.

Someone already has this type of problem? thanks!