Conference duration does not begin at 0

Hi.

First of all, i am new here, so apologies in advance if i have unknowingly broken any forum rules.

I have installed jitsi and jitsi-meet-tokens on Ubuntu 18.04 (https://github.com/jitsi/lib-jitsi-meet/blob/master/doc/tokens.md), and i am using jwt to authenticate. Prosody version is 0.11.5.

I have noticed that the conference duration shown does not begin at zero; strangely it begins at 8 or 15 something, and this varies everyday, even if i restart the machine.

Can someone help?

Thanks,
Arun

Nobody has encountered this problem? I really need some help with this as i can’t figure out.