I also suspect these are counterfeit Spinners. Real Spinners have a pretty good reputation.
OP, I would return for a refund.
I also think you should get an istick 30W full kit. The 20W is overpowered so it doesn't work well with Protanks. The 30W will work well, and is a better mod for several reasons.
Or, if you like the Spinners, I recommend you buy them from Sweetvapes. They are authorized resellers. Charge them before using them the first time.