It’s probably the water, it’s full sun south side of the house full exposure after the sun crests, but it’s in the “window well” area , so any “standing” water would go down the weeping tile system.

Idk about your code where you are, but foundations have filtered corrugated pipe around its perimeter and they have risers that go up by each window that may have a well, so it doesn’t fill with water, and into the house if it can’t drain down to the foundation perimeter one fast enough.