@natedee you can’t expect equal trading in 2 different accounts, especially if one of them is demo and the other one is different (e.g. challenge). That’s because of the different quotes provided by every broker, and also they provide different quotes on demo and live accounts as well.
The next thing you should consider and double-check is if the prop firm offers the same leverage for the assets you’re trading on your demo account. For example with BTCUSD, The5ers offers 1:2 leverage for the asset, FTMO offers 1:3 on the standard account and 1:3 on the swing account, FundedNext offers 1:1 leverage and etc. If your demo account is with some regulated broker, for example BlackBull offers 1:100 leverage for BTCUSD at the moment. So the leverage can affect the trading – with low leverage the BTCUSD can’t open trades because there is not enough margin.