Weather Widget Image Distortion

Not sure how or why this is happening, but lately I’ve had trouble with my weather widgets — either the Montréal one, or, this time, the Bremen one — wherein the background isn’t drawn properly. No other widget seems affected.

Maybe 10.4.3 fixes this, maybe not; the bug isn’t a big deal (and a flip or a refresh fix it) and I’m too lazy to report it.

Odd nonetheless. Could this be related to me using nightly WebKit builds? Shouldn’t be, as those are installed locally, not system-wide. Curious.