Keith, welcome to the forum from the Blue Mountains of northeastern Oregon!
I don't know why a TH'er would leave bad targets in a hole... I always pack them out. Mainly because if I go back to that site, I don't want to find them again! Also, I don't believe in leaving the bad targets for the other guy. Welcome to the hobby! Keep using your detector and learning it - and you do that by practicing often. Good Luck!
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ArfieBoy