An update, I use TSW 10.19.2a
The answer from the support:
"
That issue is not related with your account, the market data subscription or trading hours. That kind of scenario is related with the fact that data processed by the platform for simulated trades might be wrong.
I understand that the Demo account is handy for testing strategies and see if it worthy to apply them in the real account but unfortunately it is not 100% reliable.
"
The only thing I add here is that is a PaperTrading account not a Demo.