This is the problem I got too: in neutral position, the stick was drifting to the left for me.
I get it "repaired" one time but I got another issue after: the stick never goes to its maximal position on bottom/left (which means that the character in Pokemon Let's Go cannot run in those directions).
I had to send it back, I wait the second return now and hope it will work fine...
I can give you the following advice when you get it back, use the stick calibration setting and check:
- The neutral position several times (even with the repair, I still have some issues)
- The maximal position in every direction (by doing some circles)
Also, an important thing that I forgot the first time (because I didn't read properly the send back condition), don't forget to put a copy of the bill in the package!