All layouts are designated as “fill”.
It is resized in the work screen, but if you give motion in the present, it is not resized.
Suddenly happen now.
Screenshots? Videos? File link? Any more info? You gave just 1% of info necessary to someone being able help you. 
Seems like a bug, hard to say without the file link. You can report a bug with screenshots and a file link here: https://help.figma.com/hc/en-us/requests/new?ticket_form_id=360001744374
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