That’s me out of ideas. I imagine the only way to isolate the fault would be to wait until you get your Mac back and try the recording on that using GarageBand. If the fault persists, then it might well be the interface.
Hmm, I was going to say are you direct monitoring, but then saw the photo. Sorry, dunno. Perhaps try going direct into the Focusrite to eliminate any amp/interface shenanigans.