vm.memory.size[] value problems in 1.1b4

[pdwalker]

centos 4.2,
zabbix 1.1b4
intel box, 4GB ram

vm.memory.size[total] and vm.memory.size[cache] return values that are not correct.

Display Error 1
on a machine with 4GB ram
- top says: 4154068k total ram
- vm.memory.size[total]: 931.32 GB

vm.memory.size[total] appears fine on the 2GB machines

Display Error 2a - cache over 2GB
- top says: 2329096k cached
- vm.memory.size[cache]: 2.22MB

Display Error 2b - cache under 2GB
- top says: 97012k cached
- vm.memory.size[cache]: 94.49 MB