The text area (marked blue) does not fit with the shape area (see 1).
Right-click on the shape and select Group, then Open XXX (Bereich.28) and edit the shape manually (see 2 and 3).
If the problem appears only on several shapes on the diagram and the master shape in stencil is correct, then right-click on the master shape and start Update Instances. Deactivate ”Preserve text box position“.
If you want to avoid the problem in the future:
1. Activate the developer mode under File - Options - Advanced.
- Set the stencil in the Edit Mode, select the master shape, click on Behavior and activate Group only .