Problem changed ratio buttons, shapes in storyline project

Hi Everyone,

I have been working on a storyline project and already used some parts of it in a rise course by publishing it as a review component. The SME's asked some final adaptations, so I went back to the storyline project. I noticed that the background shape and buttons seem to have changed size and location.

I didn't change anything to the slide size, so I understand why this happened. Anyone had similar experiences? How could I restore this or solve this in a fast way? Without having to edit everything manually ... . I have so many slides so it would take me a looot of time.

I added some screenshots below to make my question a bit more clear.