When using group boxes with buttons inside, the buttons may not appear correctly during run time.
The images below depict how the visualization appears in the IDE versus during runtime:
A correction to this is to roll the visualization profile back. From the Menu Bar select Project->Project Settings. Then select Visualization Profile and change the version from Codesys V3.5 SP9 Patch 1 back to Codesys V3.5 SP8 Patch4.
After changing the Visualization Profile, the buttons will appear the same in runtime as the IDE.