The "chip" at the end of the silicone flanges is a normal part of the manufacturing process and doesn't affect their performance. It can vary slightly from flange to flange but should look like this picture. If not, please send us a picture of the defect you're seeing.
If you're curious why it's there, the silicone thickness needed for the flange requires the entry point to be larger than other silicone parts so the liquid silicone can flow all the way to the top of the flange before solidifying. Unfortunately, this makes it is impossible to cut it off in a way that's not obvious after the cut.
Reviewed by Diana West, IBCLC
June 10, 2021