No, that is common. The gasket is a food grade silicone rubber, and applied as a liquid during manufacture. It requires a catalyst added to a liquid silicone rubber to solidify the material. Sometimes during manufacture the silicone seal has not totally cured to a solid product. It attaches itself to the glass rim only because silicone prouducts are designed to stick to glass and hard glazes quite well. Think bathroom tub caulk. In any case, its OK if it does stick to the glass, but you may also want to slightly reduce the torque of the tightening of the rings so the seal doesn't cut all the way through the thin layer of silicone rubber. If the jars have been sitting a few months that too can increase the holding power of silicone to glass. The use of a 'church key' which usually also has a rounded end, as opposed to the pointed end, can easily remove lids. Its always nice to know that lids are very secure on jars once processed. I have also seen this issue with old lids, like more than 10 years old. Firtneately, todays canning lids (since about the mid 1970's) have been mae of silicone, which never dries out or cracks like plain rubber used to.

I have this happen sometimes too. Don't know whether it's the age of the lid for sure or the processing method or what. Just make sure to get that sealing surface really clean before you use it again, and run your clean wet finger around it until it "sings".

I use a 'Scotch Bright' scouring pad to remove any traces of old rubber compound attached to the glass jars rim.