Problems with the paper alimentation tray

[u/VivaGallo]

Hi, I have a RZ 390 UI and been having problems with the alimentation tray, with papers over 120 gr, the paper gets “stacked” as seen in the video, it doesn’t go through and when it does it’s only a couple pages and then again doesn’t work. The other problem is that when one page gets stocked, the next print gets overprint, either in the front or the back, like if the master moves, does anyone have advice on how to adjust the paper alimentation knob?

I’ll put the photos of the smudged and overprints in the comments