loopback tempo too fast

I make a first loop with “set tempo after first loop”. Lets say my song is around 100bpm. if this first loop is only 2 bars, mainstage tells me that its 200bpm since there is no way for him to tell how many bars I played. So since I am out of sync mode, I cannot specify how long this loop is.

Newbie here, so pretty sure there is an easy answer to that