I am having the same exact issues. Trying to move one image in my gallery block and it just randomly moved all the images all over and caused a mess. It was set up so that paintings in a series are next to each other and now they are all over the place and I'm not able to fix it because it just keeps randomly moving images anytime I try to move one. https://www.nanettepowell.com/paintings
Is there a fix for this?