why RB1100AHx2 PCQ not work?

Now I use the RB1100AHx2, version is 5.8.
When I added the PCQ limits, it works wrong.
I set PCQ limit is 2M, but in fact, the number can to 3.2M, why?
I first Mangle the connection , then Mangle the packet, like the attach jpg.
why? how to fix?
20120905163812.jpg
20120905163653.jpg

If no mistaken you should enable IP firewall under bridge interface> setting…

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why ?
how to do ?
thanks.

as shown…
Capture.PNG

thanks.
I try to do like this,but the Avg.Rate is still overed limits,
why ?

why no answers of the mikrotik’s man ?

post you supout.rif file here…

No, please don’t paste in the forum. Send supout.rif file to support, and we will see what configuration is missing. Screenshots don’t show everything

I mailed, but now still not receive the answer letter, WHY?