Credit Builder by LevelCredit works best when you use the same bank account each month to make your rent payment. LevelCredit will automatically find future payments, but this can only happen if they're in the same bank account where you've matched a payment already.
If you do have to pay rent with a different bank account one month, you can change the account in which we find your rent payment. You can remove your bank account under payment accounts, then add the bank account that you used to pay rent this month. If you go back to the other bank account, you'll need to repeat this process so that LevelCredit knows where to look for your next rent payment.