I have this strange issue, at least second time. Not sure if I had it on pre 2026.1.6.198 builds.
When I move a field (or a group) on the form in Designer studio, for example from left to bottom section, on existing workflows it's still in the "old" place. When I start a new one, it's in the new place. So existing instances are stuck with old layout. See attached - same moment, new instance and old-saved one. Two different layouts.