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.