What could this damage be?

The leaf in question is the shortest one in the second pic. Second pic is when I got it on February 6th. I haven’t watered it since I got it, they had it heavily watered that day. I haven’t repotted it either, so it could perhaps need that. My biggest concern is pests as it’s in my cabinet with my other expensive plants

It’s under a viparspectra grow light, gets humidity blasted every 2 hours in an ikea cabinet. Again, I haven’t watered it since I got it