The print head shouldn’t scape material off, at least not in the same direction. The head is floating just above the current print layer, so it shouldn’t be able to go low enough to scape the previous layer. I guess it could scrape material off on Layer 2 if Layer 1 is over extruded, but it would be scraping it off at 90º angle to the previous layer, and that’s doesn’t appear to be the case here.
I have had issues with the first layer being too close to the print bed and/or over extruding the first layer so that the extruder pushes the already-printed part up off the bed. That looks different to your print though, and produces a rough texture rather than a lined texture:
The whiter parts are not touching the bed, and flex slightly if I press on them. If I let the print continue, layer 2 pushes those bits back down, and the print finishes. Although the surface finish is rougher than I’d like.
To me, it looks like you’re under extruding, or even not extruding at all on certain passes. Were you watching when this happened? During one of my prints, the filament spool was binding. When the print head would move away from the filament spool, the extruder feeder would slip. When the head moved back towards the filament spool, it was able to feed properly. I ended up printing out one of the various thingiverse “snapmaker filament” projects to route the filament better, and it hasn’t bound since.
A clogged nozzle could do the same thing, but I would expect it to stay clogged rather than printing in one direction, then failing to print in the opposite direction. I think that pattern of every-other-line printing correctly is indicative of a filament feed slip.