I have an eleaf 100watt and i have a delta 2 tank. So for the last 2 months my ohms are a consistent 0.49-0.51 and my watts never change(I use 55W) . Now all of a sudden my ohms increase up to 0.66 ohms and my watts go to 44W. My tank is screwed on firmly as that was apparently some peoples issues. I've also put a new coil in and still the same issue.... Is it safe? Is my thing broken or just normal?like I said it never used to do that and just started to today...