Hi Evan and all,
I can confirm our team is aware and working to resolve an issue that is affecting the measured keyboard and mouse activity, which is limited to some logged segments. I apologize for the inconvenience.
This is May of 2018 and I am seeing the same thing in my contractors logs. Very low if any key stroke or mouse clicks but high activity level. Was the actual answer to the orginal OP's question ever answered. I would like to know "why the activitiy level is so high" but actual mouse and keystrokes is almost non-existent. I think that was the original question. Contacting the freelancer doesn't answer the question. I would like to know the "why" not "discuss with freelancer" since it appears to be an upwork software issue...and not a freelancer issue. My freelancer is working about 40 hours a week and a bit disconcerning to see the actualy activity so low but score so high. Beyond confusing. Is he working hard or hardly working? Would be nice to know.