This only seems to affect FM in High Sierra, have only tested it with FMPA. Have done a clean install of the OS and FMPA which did not fix. To replicate install FMPA 16 in High Sierra and enter Layout mode and move objects around. Screenshot attached.
I know it isn't easy to check for existing Bug Reports here. This is 3. Report of what was first reported as:
Maybe this is the right opportunity to once more ask for this!