Our AR listings do not agree to the GL for AR by about $21.26
When I look at the GL the balance is made up of

$783,684.32 Canadian
-$40,149.12 USD / $52,626.70 CAD
For a total of $731,057.62

The AR listings show that it should be
$766,454.58 Canadian
$27,516.89 USD / 35,418.22 CAD
For a total of $731,036.36

Is there a way to adjust the GL split to match the AR listings split?
I have no idea how they got out of sync I just want to fix it.

Yes this adjustment can be done.

I am having the same problem. The difference is more significant in my case. How could this happen?

There are too many possibilities to cover in a forum. the most common issue is posting an adjustment in Ledger to the Control Account. The sub-ledger doesn't know anything about this transaction.

In ledger look for transactions with a Transaction type that starts with GL.