glance RSS/VSS data column

hi guys... i got a problem... i have written a trivial test program which allocates some memory, it waits for a while (enters a loop), and then releases that memory. the problem is that although glance depitcs the memory allocation procedure properly - by updating both RSS and VSS data segments column - something weird is happening during the deletion... both RSS and VSS data segments remain unchanged!!! Should this be happening? thanx in advance...

PS: HP-UX B.11.00