Curious water loss and gain within a week.

I noticed a strange thing last week, after all the rain ceased here in the Northeast, my pool water level was really good. Several days later, I was out there hooikng up the robot and noticed I had a 1" loss of water. Then a few days later, it was back to normal. I believe it happened a few months ago too,soon after I opened the pool, I noticed a water loss of about 4", so I started filling it on and off for 2 days ( I'm on a well , so I had to break up the fill times) and I went to start...

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