I am confused about something. I had put my game on pause & at that point I had 2500 food in the bin. When I came back to play the game my food down to 550. What's up with this? How can the food disappear when the game is paused? Anyone had this happen?

How are you pausing the game? Depending upon how you pause it, it might not be truly paused.

I am going to the menue & clicking on the pause button then I click on quit

I think it was not really paused!

You may look on Support FAQ,
I paused my game overnight, but my villagers all died. Why did that happen?

And on these threads:
Pausing the game
Paused. Is it really?