LNBits shows the payment as having gone through (which is incorrect, but it means it probably handed it off to LND successfully).
Once I get to the root cause, I'll open a ticket on LNBits requesting that it be made clear in the UI whether a transaction succeeded or not.
Because it does make sense to gave it in the transaction history so the user knows that LNBits got the request and dutifully passed it on, but the payment was not received and thus your account balance has not changed.