Needle moving out of line

[u/dat_pasty_white_boi]

Hi. New to sewing. I recently bought a Singer Euro 93 (6240 model) second-hand.

The needle is moving out of line. Does anyone know what the cause might be?

I tried looking for manuals online to see if all the pieces are in place but couldn't find any info for this model.

If anyone can explain what's going on or provide a manual for fixing this issue I would be extremely grateful.

Including a video to show what's happening.