I thought I was here about a week ago with a little problem. The pictures came up in miniature size and distorted. I found the solution and came back to say what it was, but now I cannot find the thread. I cannot have been dreaming?!
However, today again two pictures came up wee small and distorted, and the bug was the same as before:
In the code of the picture, in its “advanced settings”, it says “alignnone size-full wp-image-24875”
Simply delete “size-full” and the picture shows up in the desired size.