Your crypto delivery is tightly dependent on the payment methods and blockchain networks used in the transaction. Please read more about it in our article here.
That being said some delays on the demo environment specifically might happen due to the liquidity provisioning issues - Ramp Network is also dependent on services such as faucets.
If this type of issue is related to the production environment and your transaction seems stuck, please consider reaching out to our Support Team, if this issue persists on the demo, then it’s most likely a liquidity problem and you can directly report this to integrations@ramp.network.