Safari Opening Multiple Duplicate Windows

For some reason, over time Safari will randomly open a duplicate window with all the same tabs open as in my main window (I'm using tab groups which maybe is a part of it). It isn't when I open a link from an email or when I put my computer to sleep, but I'm not sure what the pattern is yet. Has anyone else faced this problem? And how do I make it stop? It's taking up a ton of room.