A receipt shows more than my rent. Why?
The total is what was actually charged, which can include a card surcharge or a late fee. Every receipt breaks that out line by line and shows the rent figure separately, precisely so the total and your lease can be reconciled.
From the guide Receipts, Notices & Statements.
A receipt is issued when the money arrives, not when it is sent
A rent receipt is produced on settlement — when the funds have actually reached the recipient — not when the payment is submitted. On a bank transfer those are two to four business days apart. This matters: a receipt issued at submission would tell you that you had paid on a day the money had not moved, and would still say so if the bank later returned it.
Read the whole guide: Receipts, Notices & Statements