Please ensure you have some native tokens of the network to pay the gas fee for the withdrawal transaction.
Gas fees can be considered a network commission charged by the network. It depends on the network conditions and the price of the network's native tokens.
To pay the gas fee on the Ethereum network, you need a fraction of an ETH token. To pay the gas fee on Polygon, you need some POL (ex MATIC), etc.
If you still do not see your tokens, email support@stobox.io for checking. Send us your screenshots, and let us know if you log in on one device or browser only.