Windshield Repair Forum

Every so often my chip repairs leave a clear circle, about the size of the injector seal (Delta kits). I'm pretty sure it's not because its too tight or there's too much pressure and the windshield is not too hot. (40 degrees and I use the defroster)It's very clear and shiny and the rest of the job looks great. You can harldy see it unless you look from the inside.

Any ideas here?