I’m having a very similar issue. I only have two auto posters set, the first being Facebook and second is Twitter. Facebook always works, no problem but Twitter only goes if I do the (re)send. I did some testing, deleted the Facebook autopost setting and Twitter worked automatically when it was the only one listed. I put the Facebook one back and then it only went to Facebook and not Twitter. I’ve determined it’s only the first destination that is getting the post and not any other. I did add in Tumblr at one time and it didn’t get the post either, only Facebook.

I’m guessing there is a setting somewhere i’m missing, but I haven’t been able to find it yet.

Thank you,
Scott