I was able to recreate this behavior in a 1v1 mission in which the AMRAAM hit my first AMRAAM.
I swear I had the Bandit locked in TWS.
You can see how the second AMRAAM goes PITBUL immediately after launch and go for the AMRAAM
Harlikwin, our suggestion with the pulse doppler shift makes sense but in this case the missile was flying away from me and even though it went for it and disregarded the feed of my Fire Control Radar Feed.