bandwidth interface distinct max simple queue

please, i need an explanation of this

RB1100Ahx2
Balancing From 2 isp, wan1 on ether1 isp1 max bandwidth 120mb, on wan2 ethe2 isp2, max bandwidth 20

Maximum bandwidth limited by simple queue ether1 90mb, in ether2 20mb.
Why does ether have an bandwidth much higher than the maximum allowed in the queue?

ethe1 = 120 mb (maximum contracted in isp)
ethe2 = 12.5mb

No fasttrack in firewall