If I Import > From a Folder it opens the mini-Explorer in top left corner. If it resize and move it to center, then close and reopen, it starts to go to top left corner but then relocates to the place and size I moved it.
This means that the default of being able to reposition and resize a folder is being remembered even against the program's default open location. This is how Windows should work, and when it doesn't it's almost always been due to a program conflict. If turning off all Startups (in all four locations I list where they can hide now) doesn't work then I would use Autosizer.
I believe I found the issue. It's causing by display scaling in windows. I always use display scaling because 100% is too small on high resolution monitors. When I turn the scaling to 100%, it remembers the window location. When I set it to 125%, it won't remember it. This looks like a bug in Windows and would explain why some people don't see it happening. I'm guessing you're using 100%? How can we get in touch with Microsoft to fix this?