Bottom gasket doesn’t seal the threads

Ok so I bought 2 of these for my master bathroom renovation. The first time that I installed these was easy and pretty straightforward. So I thought anyway, both of them started leaking into the brand new vanity and after 4 or 5 times of removing and reinstalling they still leaked. Apparently the bottom seal just won’t seal properly around the threads of the tailpipe so I ended up using plumbers putty around the tail piece and then putting the gasket and nut on to stop the leaks. After searching online about the problem, the only thing I could find was that this does happen sometimes with drains but nothing about it being a defect of some sort. The bottom gasket is supposed to work but in some cases it doesn’t and that’s when you have to use the plumbers putty on the threads. I just find it odd that I bought 2 of them and they both leaked.

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