There can be many reasons that cause the discrepancies with expected deposit and actual deposit. I would suggest that you check the followings:
1) all cash outs, pay out, tip out are done properly.
2) cash drawer count is accurate
3) the starting balance matches with the money in drawer
4) review your "Cash and Loss Management" report. Look for any suspicious activities.
The community can provide more accurate and helpful feedback if you can share more information on the situation.
