bug: Column renamer

This morning when I open KNIME, it comes out the information that I have some columns were renamed more than once, so I ckeched that all my workflows which are with node 'columms renamer" have the same problem. here is just one case, as you can see, I try to fix the congfigure but still the system give out the warning, and I can’t skip it.

My version is 5.2.1