There could be many explanations for this. However, trust and believe that there is more than one person trying to be the head here.
Ok..... if they had already asked you to do two sundays, then it seems they had already decided that they wanted you. Some other person (with a lot of pull) said "well what about" or " I think we should get...". This type of thing always seems to backfire on them. I've seen it to many times.
As for your style of playing... I have found that it's not about how well and what style you play all the time, but your character and integrity. Keep doing what you are supposed to do and watch how things change. Let them do what "they feel" is best and allow them to see the flaw.