Hi @diver1rn ,
My guess is that during the time sync when your device reconnects to the Cloud, the timing could have changed and altered.
If helpful, maybe you can check the time of last sync: Device OS API - Photon | Reference Documentation | Particle
I supposed you know how to change the device time.
https://docs.particle.io/reference/device-os/firmware/photon/#particle-synctime-
Some prior discussion: Setting a custom device time, without having to change SYSTEM_MODE - #2 by ScruffR