Hi dayananda.venkatesh,
Can you please share a screenshot of the Staff Member properties page?
As Kristin mentioned, if the soft and hard allocations are different, then the booking status should be mixed.
In Admin - Project Management - Settings, you have an option to disable mixed booking but if that checkbox is enabled, then you will not be seeing Soft and Hard Allocation in the properties page. Only one of them will be seen. But since you mentioned that you are seeing mixed booking in other projects, then this checkbox should be in disabled mode because if you have a mixed booking in the system, the checkbox will be disabled.
Thanks,
Jerin