Sorry for all the previous replies as we didn't understand the issue earlier properly.
We were assuming some other issue and due to that we asked for details.
But as we checked in deep we found that there is no issue in the server and virtualizor.
On File based storage the allocation happens when VPS starts consuming the storage.
The Dashboard provides real time available storage space on the server.
I Hope it clears all your doubts.
Please let us know if you need any further information.
What don't you understand resuce mode does not work on any KVM VPS!