yeah it is. Knowing that is concerning. I'm using the Ender 5 pro so it comes with the silent chip motherboard and if that's the case then it's not good. But I do believe I have over 1 year warranty incase that is to be the problem. So far my prints are looking much better than before, and I managed to print those small rings at a good quality (Just need to sand the lines off the surface). I have that at a flow rate of 80 with the current E-step. I hope it doesnt fall into the same problem as yours also. And I did notice when I very first used the printer, it extruded fine I believe when printing my first piece but then printing over things, it was under-extruding which led me to calibrating everything like right now.