The marks are most likely from the printer’s paper transport/roller system contacting ink that hadn’t fully set yet.

Hot press fine art paper has a very smooth surface, so it can be less absorbent than rougher papers. That means the ink may stay wet longer and become more vulnerable to friction from the transport mechanism, which shows up as wheel or roller tracks.

A likely contributing factor is room humidity and paper condition. If the room is humid, drying time increases. If the paper hasn’t acclimatized to the room, that can also affect how it handles ink.

What to try:

• Let the paper acclimatize to the room before printing.
• Reduce room humidity if possible.
• Handle prints carefully and allow more drying time after printing.
• Double-check you’re using the matching media setting for that paper, since ink load and paper handling are tied to media type.

Since your glossy prints were fine and the issue appeared with this specific fine art stock, the paper’s slower drying behavior is the most likely cause rather than loading the wrong side.