i'm using rb gr3
using 2 wan load balancing
wan1 8mbps
wan2 8mbps

Speed is ok but in interface wan1 and wan2 can not calculation speed properly
i have a screenshot
wan1 wan2 7.something mbps whats the problem?

Paste here you ip route export.

It looks like each interface is running at 7+ mbps. Are you confusing the MB of your file transfer with your interface speed of Mbps???

Otherwise I guess I don't really understand the question, you didn't make it very clear. If you get 8 mbps of download per wan and each is running at 7.5, the problem might be from the ISP and not the Tik.