Slade issue with saving data

[Waffendoomer]

So, im making a wad for a few months now, been going fine.  i save it in doom builder, exit out and open it in slade; the map pic shows the changes ive made, but when i save and then load up the map in GZ doom its stuck on the last save i made like, 5 hours ago. no errors pop up, one way around this i found was by saving it as a whole new wad, but overloading my computer with xxxxcopy1, xxxxcopy2, etc etc gets annoying. any ideas what i could be doing wrong?