Hyper-V - Assigned Memory wrong value

Hi,

So I'am using dynamic memory on some VMs I have running.
To test it I launched a stress test and I saw that the memory on the server was incremental increased until the maximum memory was reached.

Server: Almost 90% of the assigned memory is used.

SCVMM:

However the assigned Memory is 3,02 instead of the 8GB we see on the server.
How is this possible? It isnt a problem of SCVMM as Hyper-V shows the same value.

Server is 2012R2,
SCVMM is 2012 R2 (3.2.8)
All Hyper-V hosts are 2012 R2.

Any ideas on why this isnt updated? I tried to Live-Migrate and to wait for a few hours (90% on the server) but no succes.