More than half of my zSilver has dissapeared

this morning I opened up my soft miner and found that I only had 1,948 zsilver. I had actually kept track and originally had 5,501 zsilver

This are the logs I kept in notepad:
Razer Silver log:

Start
Febuary 3rd 2019
10:38pm
5,286 zSilver

Finish
Febuary 4th 2019
12:08am
5,376 zSilver

Start
Febuary 4th 2019
8:01pm
5,379 zSilver

Finish
Febuary 5th 2019
2:00pm
5,501 zSilver
(was a while ago but its what I remember having)


But when I checked this morning I had this. has something happened to the software?


I hadn't bought anything with my silver as I have been saving up. this is all very peculiar and I would like some help.