system-load-plugin 0.3.6 shows wrong free memory in 64bit linux

I'm using Archlinux 64bit and run Xfce 4.2.3.2 with the latest plugin
xfce-system-load-plugin 0.3.6.

I'm getting a strange output of free memory. the plugin shows right now:
2805MB used memory
and the output from free -m is:

 free -m
             total       used       free     shared    buffers     cached
Mem:          3016       2988         27          0        803        182
-/+ buffers/cache:       2002       1013
Swap:          235          0        235


So I guess it shows the amount of real free memory 2002MB + used buffers
803MB. Should that be right?

And as I remember I hadn't this behavoir in archlinux 32bit.

Andreas Radke