Then you definitely have a problem with your carto's. You bought ten of them? From where? Send them back if you're not satisfied. Most company's wont have a problem with that as long as they're not all used.
I got the 10 from IBT when I ordered my tank. The 1.8 ohm was from my local spot Kalamazoo Vapor and the 2.0 is from IBT both are the same issue. It wouldn't be worth it to ship them back. I have been running this set up for a while now and only recently started having issues. I;m not sure what the deal is. When hitting this OMFG first few vapes are good then the flavor changes almost get a peppery taste. I switched about 1 week ago from fruity/ cheese cakey type flavors to this tobacco and the chai tea. I'm wondering if it's the flavor in general are a bit on the harsher side. I have never tried cinnamon but I imagine that would be pretty irritating after awhile.