Being honest, same here. Joycons were my first experience with drift, ALTHOUGH i bought an Orange PS4 controller last year with such problems too. I had never heard of it except on the joycons, so it was funny. Almost thought it was some chinese knock off, but it has been a real problem i see.All my analogue sticks are perfectly fine. Since PS1. The first time I've ever had this was with the Joycon.
My original ps4 controllers works fine though.