Code 83 Super-Flex w/Cncrt Ties 3'

I have used bunch of code 100 as well as this code 83 flex track without any problem whatsoever but this piece, which I bought as a single, just flat out refused to be part of the program. When the track was flexed one of the rails just popped right off the ties and would not be go back where it belonged despite my efforts. This piece must have been the bad apple of the barrel. I have not had trouble with the other 83 flex track which have since used. I really should have returned it but covid and all that. C'est la vie.