First things first: Welcome to this forum
Crypto currency wallets take some (a lot of) time to get the whole data necessary to be able to show how much money you have because often they have to scan the whole transaction history. Are you sure the wallets synchronization according to the used crypto currency is completed? Because new data is added continuously, the synchronization will never be 100.0%, but it should be near to it.
Depending on the used currency, there are also light clients which take less time and just asking other full nodes for the data they need. Sadly, I don’t know if Wookey is supporting this or what kind of settings are necessary for this because I’m not familiar with Monero/XMR supported by Wookey Wallet.