Oases

Why do oases lvl number change? Sometimes after I resign an oasis it might go back to being a lvl 9 or it might change to a lvl 0 or so other number. Does this have anything to do with hunting it or been occupied too many time? Ty for your help !

Every 24 hours of occupying it, it drops a lvl. Every 24 hours it is unoccupied it rises 3 lvls.

If it's level 9 it can go to level 2.

It's just part of game play, think of real life, if u have a patch of farmland and u heavily plant there, then harvest, the soil wouldn't be quite as rich, so u get less harvest next time etc., plus if it stayed lvl 9 it would make the game so easy