Why does my stack decrease even if I am not playing?

My stack dropped 1415 chips even though I am not playing. Can anyone tell my why? Doesn’t seem kosher to me?

be more precise, your stack on your account?(I guess not because you have several million chips) your stack on a cash game table? a tournament? if it was a tournament it was probably the antes and blinds combined that melted your stack without you realizing it, for my part I never observed the slightest chip bug on the game