I have the same exact problem trollman and OP described. Firebender Ascension only shows the 1st trigger in the stack but shows multiple triggers which you can reorder in the middle UI. The UI used to highlight the trigger source card via hover-over on the battlefield but doesn't anymore. The triggers can be reordered but you don't know which one is which .

Same issue as of February. As I see it, there are two ways to fix this. You could highlight the attack trigger's source on the board when highlighting a given Firebender Ascension trigger instead of just highlighting the Firebender Ascension (or any other way to identify where the triggers originally came from).

Another idea is to make the Firebender Ascension triggers to match the order you arranged your attack triggers as the default. This doesn't fix the underlying issue of unidentifiable triggers from a single funneled source, but it does cover like 95% of use cases.

The new attack triggers interface doesn't even let you order all the triggers BEFORE the Firebender's Ascension goes off. The box fills up and the extra triggers are stuck behind the other ones and you can't click on them to move them to the front or the back. There are Arabella triggers in there, but they can't be moved to resolve last because the box doesn't handle the extra triggers in an acceptable way.