Spectra pump with Avent bottles

Am

Anyone else have issues with Spectra flanges not screwing onto Avent bottles tight enough?

When I screw them onto the Spectra bottles they seem to lock in place but the Avent bottles are always loose and almost falling off. I had to order smaller flanges but they are made by Spectra so that shouldn’t be an issue. I can’t use the Spectra bottles for my first pump of the day because they end up overflowing. Am I doing something wrong?