Hi,
i had a similar problem but it would resize my images disproportionately in a single post. My issue was not height, but was width. i used img { max-width: 100%; height: auto; } in my Stylesheet (style.css) and placed it in the beginning of the /* ———- Grid Items, Single Item and Comments ———- */ section. This seems to work for me. For you perhaps, maintaining a max-height:100% would work. Good luck, sorry if this is too late.
I had my Host resolve this issue for me.
