Bandwidth levels lower than expected.

I am monitoring the same circuit from both routers, and am seeing very different results on both sides in terms of bandwidth usage. Here are config snippets.

Router - A

interface GigabitEthernet0/3
no ip address
ip route-cache flow
duplex auto
speed auto
media-type rj45
no negotiation auto
end

interface GigabitEthernet0/3.303
description Private
bandwidth 44210
encapsulation dot1Q 303
ip address 1.1.1.1 255.255.255.0
delay 20
end

Router B

interface GigabitEthernet0/3
no ip address
ip route-cache flow
duplex auto
speed auto
media-type rj45
no negotiation auto
end

interface GigabitEthernet0/3.303
description Private
bandwidth 44210
encapsulation dot1Q 303
ip address 1.1.1.2 255.255.255.252
delay 20
end

I have attached two graphs labeled Router-a and Router-b to illustrate the discrepancy.

What could be causing this?

Thanks...[/img]