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This bug still exist on version 2.5.2-RC - https://forum.netgate.com/topic/160046/traffic-graph-showing-wrong-speed-after-enabling-traffic-shaper/
Note, both WANs are PPPoE
I have seen it reported many times in the past. It gets fixed and it resurfaces often It is only a cosmetic issue. You have to remember to divide by 2. :(
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Updated to the latest version, still same.