Were there changes to Semi Active Radar missiles? Can't find anything on it but they're behaving stupid

Ran into a very strange behaviour when launching an R27ER. It flew out wide then came back in and went for a team mate instead of the target I was actively illuminating with the radar. Team mate was to my lower left, the F16 was to my upper right. Never had a semi active go for a team mate in that launch position, or take a sharp turn in the opposite direction to the target. It was a rear launch.

Has something changed that isn’t documented? Or is the documentation hidden? Is it missile specific?