x3 experience not working

[Win_7]

I have observed that when using high end weapon of commando such as galil , GPMG, etc the number of stalker killed is not multiplied x3 and is recorded as 1kill only.

But when using low end weapon like Tommy gun or hk417, the x3 exp is working fine. Can you please fix the bug? Thanks.

[Win_7]

Am not sure if this is the same case but when i play alone as firebug Lv27 on ZM4 on hell on earth mode, despite my x2damage and x3exp,

i only get about 0.1M experience or less in 1 wave. Is this really the how it is supposed to work? It is rather verrrrry Slowwwwww progression of perk and would make donating for

exp and damage boost useless for firebug. Now if it is a bug, Could you please check on it? Thanks.