I replaced my Ultegra R8000 inner chainring from 36T to 34T. After installing, I made sure there was enough clearance between the inner chainring and the chainstay and spun it to make sure all is good. However, after today's ride, I realized that the chainring has gotten closer and scratched the paint off the frame. The components are fairly new, so there shouldn't be anything wearing out yet.
What could be the problem and what did I do wrong?
Thanks in advance.