To resolve the imbalance on the two tabs you need to change the transactions with a VAT Type set as both, then on the Header tab of the return click RMB and select Rebuild. This prompts a message that explains the transactions are cleared from the VAT return and the rebuilt.
To filter on the Analysis tab:
Click the drop down on the field Displayed Items and select preference (Included for example) park on one of the entries.
Click RMB and select Detail. A pop up screen appears and depending on your preference it details the transactions.
The VAT type on transactions should be set as Input or Output.