If you don’t mind, you make the activity public & share it so we can see. You could also post the BT report in the Breakthrough Thread if you’d like!
If you did exceed your MPA during the ride and get a Breakthrough… Xert needs to apply your new signature such that your power only touches (but never exceeds) your MPA, since Power can’t ever exceed your Maximum Power Available (by definition). If that’s the case, you can open the activity, scroll to the bottom and push the ‘previous’ button, which will show the MPA data using your old/starting signature! This should align closely with what you would have seen in real-time! 