The anime version of Hayate no Gotoku has been done by three different studios so far:
Each studio's version is a little different. For example, SynergySP focused a lot on parody while JC Staff focused more on romance.
I've seen a few shows switch studios once, but switching twice seems extremely rare.
Why has it switched studios so many times? Was the creator unsatisfied with what the previous studios did to the story? Was it just some financial matter?