Microsoft Fabric Bug: DataMart keep changing and cannot be controlled

I don't know if this is because of the preview but this is dissapointed with the bug I got in Microsoft Fabric. I was working on building the data mart and created a model with 10 tables and 20 measures. Everything works ok even I created 3 power bi dashbaord with it but suddenly when refresh the page it went back to only 1 tables and everything is deleted. No one else has access to the data mart beside me and I only refresh the web browser now everything is gone. Anyone got the same issue ?