Hey there mate
So im no expert, just getting that out of the way first, but i have an idea. To me it looks like the part is delaminating and curling on the corner which iv found to happen to a few prints of mine. Since its so high up in the air its cooling and shrinking pretty fast so maybe try to give it heaps more surface area to stay straight. Try this :
Let us know how you go on. Another Tip could be to put a cardboard box over your printer as mentioned before the material might be cooling too fast and the box over the printer will act as insulation to keep the temperature in.
All the best and good luck.