Enabling Bandwith and Qos manager engine slows down downloads

Hello,

As I would like to shape my traffic a bit I installed "Bandwidth and QoS Manager" from the Marketplace to ClearOS 7.5
I have a DSL connection with a speed of 51998/10448 Kbps (taken from the modem status). Download speeds that I measure with speedtest.net are at most 49700 /10150 Kbps, which I think is okay.

After installation of QoS, I did not change anything just using the default settings that put ping, ssh etc in the high priority groups.

What I do not understand: the moment I switch on the QoS engines all my up/downloads(even from the internet directly to the server) are limited at around 10000/10000 Kbps. Which leads me to believe that it is limited to 1/1Mbps. Yet the speed of the external interface is indeed set to 51998/10448Kbps.

1. Is this to be expected?
   
2. How can I make sure that the full bandwidth is utilised if it is freely available?