11.6 HTTP compression limit

Hi Guys, I have the default http compression license which provides me compression up to 50mbits, the thing is, I am using maximum 3Mbit/sec of http compression throughput (checking with statistics, it clear show plataform limit 1Gbps, License limit 48Mbps, Current Value 3Mbps, and checking the graph it never go beyond 20Mbps) but I am still getting the following message:

        Compression license limit of 50 Mbit/s exceeded today.

How does this limit works? I thought that as far as I don't cross the 50Mbit/sec limit it should be fine, so I don't know why I am getting this error with only 3Mbit/sec throughput.

Can someone help me to understand this?

Thanks a lot!