One of your toilets likely has a slow leak at the base of the flush valve. It may be an almost silent leak. Change out the yellow gasket, Kohler # GP1059291. Available at Ace Hardware in Wildwood for a few dollars. Consider swapping out this gasket on all your toilets at the same time, like changing smoke alarm batteries. Minimal skill required.
I had the same issue with a huge fresh water leak somewhere and a nice lady at our water service (CSU) told me about the likely leaky gasket. She was right on the money.
Hope this helps.
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