New User - NEED HELP

Hello everyone, so im having trouble because in all my movies the background is red, i cant see the previous slide even when i put in a new background and i cant repaint the background, this happens in all my movies, its always red and unchangeable, please help.

Cant wait to hear back,

Example is below.

It’s probably the Onion Skinning that’s enabled
showing a bitmap silhouette from the previous