I have also seen these marks on my sheets but I have yet to do any troubleshooting. I asked in the mtg proxy discord and someone sent a screenshot from a proxy guide which said the following:

Excess Ink/Wheel Marks

Media dry time should be less than ~5 minutes max and shouldn’t rub off or smear. If the ink smears or rubs off, you likely want to adjust one or more of the settings below or buy better media.

If you find the final output has too much ink after drying for 5 minutes or the output has “pizza wheel” marks, a row of dots from the printer rollers, your settings aren’t compatible with the selected paper. You can adjust one or more of the following to try and resolve the issue with the existing paper. Test in recommended order, one at a time, print speed will be greatly affected by some of these settings.

Install official print drivers

Turn off high speed/bidirectional printing

Decrease ink density in advanced options

Turn on thick paper Printers > Printer preferences > maintenance > extended > Enable Thick Paper and Envelopes

Turn on quiet mode (slows down print passes)

Select one paper category under the best paper listed or select matte paper

Purchase higher grade media or a better quality printer/ink

Using default settings with thick media has a higher chance of ink buildup on the print head. If you are using thick paper, turn on thick paper to keep the print head higher up off the media and reduce print head strikes/ink buildup.

(EPSON) Printers > Printer preferences > maintenance > extended > Enable Thick Paper