I have been hitting my regular beach spots and with the PI, I am digging deeper and finding everything and still learning the machine. I do get some what I call Ghosts where I'd dig and whatever was there is now nowhere to be found. I had the same problem with my other MD.
Other then junk, I found so far one token and a old button.
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You could have come across a ferrous target that was just a halo and you disturbed it breaking it up... I don't know where you live but do research on the beaches you hunt... you can start by googling vintage postcards for your area.. you can be surprised by the amount of old beaches that were in your area back in the day.