OMG i just tested it again with different TV shows then i did before. and now it suddunly worked. it must been like you mentioned in your post "Maybe some folder (which you haven't selected) has the same name as the new name of a folder being renamed?"
i'm so sorry not knowing better and for wasting you guys time. but just for you guys to see, i will add 2 images when i try to rename with the movies that didn't work before. i just renamed like 8 TV show folders and BAM it worked. i would like to know one more thing, is there any possibility with multi commander for me to add 3 text files to multipel folders at onces?
thank you both for the quick reply. truly appreciate it