I have one client machine that runs constantly between 125-135ghs and another machine that runs between 4-5ghs yet I never see anything above 125ghs combined through the web site. I usually see 110-115 and sometimes in the 90s. Is there any explanation for this or am I missing something?
Look at your average hashrates per shift. Those are more accurate since they are estimated for a whole shift, not just a couple minutes of mining.
https://bitminter.com/shiftsThese hashrate estimates you see on the website only count accepted work. If you have a lot of rejected work and/or hardware errors (miscalculations) then that will affect the results.