rb1100 + rc11 queue tx avg rate problem

Hi all,
I have an rb1100 that has a display problem on the simple queue section.
Like you can seen on the image, the rx value are shown correctly but the tx no. Other rb 750G, with same firmware, all works well.
What can be?

Thanks
rb.png

Are you shure is only a display problem? Is the upload being limited anyways? Do you have pppoe server running in a bridge?