Workspace tab stack glitch

So I've had this happen twice now this last few days. I'll open a workspace and all the tabs are lumped into one stack. I'll reorganise it then some time later when I open the workspace again all the stacks are lumped again.

8.2.4133.76 (Official Build) (64-bit)

Windows 11 Version 25H2 (Build 26200.9457)