Wallet is only able to download transactions that have cleared. If you are missing transactions please make sure you are using the latest release and wait 24 hours to check if your missing transactions have appeared.
If your account is not updating in Wallet, you'll need to contact our Support. Missing transactions must be manually entered in order for them to appear in Wallet.
Do the following steps:
Go to Settings > Accounts > Disconnect > Add the missing transactions manually > Reconnect the account