Lost Mining crypto on mining window

After a pc restart, the crypto mining window has now lost my wallet amount that was there an hour ago. The Norton wallet shows the amount fine, just not the crypto mining window. Disconcerting  a bit. Refer to uploaded screenshot.

2nd question: as you can see on the image uploaded, the hash rate is rather low at the time of the screenshot, usually runs between 45 and 50. I've even had one show a rate of 155. That seems odd when seeing others' rates. Is it common for the hash rate to change on each session? Thanks for any feedback. Mike

Here is the screenshot in .zip format