Yogi, I just thought of something. When I got my Vevor 270, I tried it at first using the included dryer style to 3 prong 20A/120v and everything worked fine. I dont have a dryer style 220v in shed, so I ordered a dryer to 25a/220v twist lock (that's what my generator has, old welder, and shed) and it worked great for a 2.2# roll of wire. I waited a few weeks to get a 10# roll, and then I got feed, some very week sparks, and no weld, on arc or mig. I cuse a bunch, regret purchase, and all that. Then, I think, let's try it back on 120V, works fine. What had happened, the cheap Amazon cord adapter had a short and burnt up inside the male connector.
Point being, check your cord adapter (if running one), but if that's not it, get that thing returned ASAP