cannot centre-align images anymore + resize

Hello,

I’m using Savona Edge. At the beginning everything was alright. Then, something changed and now when I post an image in my blog, it doesn’t centre align anymore (the problem occurs only in the editor page, not in the visual webpage.

I didn’t anything particular if not only changing sizes of my images in Simple Image Size, could this have affected the images editor somehow?

Also: I have another issue using Simple Image size with Savona Edge:
what parameter is referred to the feature images sizes?
savona-slider-full-thumbnail size,
savona-full-thumbnail size,
savona-grid-thumbnail size o
savona-single-navigation size?
As you can see, my blog posts show all different featured images sizes..

Thank you very much

The page I need help with: [log in to see the link]