Did they just make the page look basically the same, but reverse the order? If so, then that's on them because of shitty UI planning. Making such a drastic change should come with an equally drastic visual layout change to disrupt the automatic mental flow that goes with muscle memory.

I feel you could choose another metaphor though, and it would make sense.

Like, when you go to a shop to buy something or buy something online, you have already chosen the destination. Then you decide how you pay, choosing the source.

To me both make sense equally.

Sure... If I want $300 in an account, that's my goal. I don't want to decrease another account by that amount

So my goal is to move X money into Y account, or maybe all but X money into Y account

The second half is where it comes from. It's not the goal, it's the means

But again as I said, flipping this is a worse solution than either direction

It depends on how you look at it, and how it's presented

You don't fill a hole by grabbing dirt and finding a hole, you realize you need to fill a hole, and then you grab/buy materials to fill it in with.

It's just a matter of approach. You can frame it in either direction

Can also think like this, "I have an invoice that I need to pay. So I need to pay to there, let me figure out where to get the money from", i.e. impetus/problem-based thinking instead of process-based thinking.

The process is move X to Y, but the need to get something to Y actually came first, like Y is an invoice, or an account that is overdrawn, or whatever. Y created the "problem" initially, and then moving from X is the "solution".