Probably it thought you searched for images from Romania that have been on the Mega file sharing service? Which in itself sounds, at least superficially, like something that would be very CSAM-ridden. It's likely a scunthorpe-like mix-up?

It used to be (and may still be) that NSA searched internet traffic for magic words. (Xkeyscore)

False positives galore.

NOW EVERYONE DOES.

With software as smart as grep.