Garlic are planted a bit deeper than onion sets .
Onion sets with tips showing , garlic with tips just under .
I don't know how deep you mean by deep , but the bottom of the clove should be about 1" down .
I just 'found' a load of garlic whilst digging the plot ready for this year .
I moved 200 in the end .
They were about 3 tall at the time and have grown on ok since the move a few weeks ago .
Mine looked like leeks till i dug them up , then you could see the clove .
Would i move them ? , dunno , all depends if they are really deep , or just a bit deep . But then again they are up , so maybe just leave them .