This problem is only visible in certain enlarging factors (using Ctrl +/-). It can be seen in the diagrams attached. Please check the words 'UnavailableInd' and 'with' in both the diagrams.
Hello G., and all,
See similar issue and exchange about the same topic here:
Then, please to test one of those possibility:
skinparam lengthAdjust spacing
skinparam lengthAdjust none
skinparam lengthAdjust spacingAndGlyphs
If that can help,Regards.