Co-op concerns [CS major / international]

Just to build on the post from @mmom99. Our son entered freshman year in 2016 and signed up for co-op interviews in the spring. When he got his sign up date he had been lumped in with the juniors which was the day after when most of his friends went. It seems that his AP credits plus his courses in Fall and Spring meant that he would be a junior at the end of his freshman year. (Anything over 60 credits apparently). What this meant was that most of the Co-op interview spots for Freshman had already been taken by the time he got to sign up. Has anyone else come across this? It’s the first time his AP credits have seemingly worked against him.