Old entries not allowing account to reconcile

I'm trying to reconcile different account files but cannot due to old entries pre 2016 not being purged correctly and still in the system.

Example 1:

ATO PAYG (W2) Installments

I have floater from 30/6/13 that is sitting as a deposit but has no withdrawals to match it to so is throwing the reconcile out. Obviously the other items were all purged but this wasn't

Example 2:

Undeposited Funds

2x receipts that have showed back up but were orginally cleared from 2019 

Some accounts like Customer Deposits have calculated balances in them that don't match anything outstanding and i don't know how to find them. This is also not the only account that this is occuring with.

Can somebody please give me some insight as to why this is happening and how to fix it.