I think this has probably happened to us all at one time or another.
Sounds like a "false" signal, might be due to a "hot rock" or heavily mineralised soil.
Best thing to do is get yourself some "targets" coins, bottle tops, nails whatever.....
Bury them at various depths in your yard. (mark them with various colored golf tees or the like).
Then go out and learn the different audio and screen responses you get.
You can check how accurate your pinpointing and depth reading are this way too.
Personally, I've never relied on "depth" readings or "Target i.d's", I haven't found one yet that is anywhere near accurate.
Oh yes...... that reminds me! I had this very situation once... signal... dig hole....nothing there.... still a signal.....dig deeper....still nothing...... and so on......until I gave up.
When I got home I realised I was wearing steel toecapped boots!
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