Sort of a newby. Tried and abandoned BIAB twice in the past. New interface - 3rd time lucky?

I am entering chords to a song. Form looks like this:

8 bars and take 1st ending (1st ending is 8 bars long)

Repeat 1st 8 bars, and then take 2nd ending (2nd ending is 8 bars long)

32 bar form then repeats.

I've entered the chords. I put a 1st ending starting in bar 9, lasting 8 bars and repeating to bar 1.

When I play it, it plays the first 8 bars, takes the 1st ending and then repeats back to bar 1. That's when trouble starts.

On the second time through the first 8 bars, it ignores the changes. It grooves along on Gmaj7 for 8 bars, and then takes the 2nd ending. Upon taking the second ending, it plays the chords as entered.

I've spent an hour and a half on this and I'm stuck.