find doesn't find some files ?

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 I recently met a very weird "bug" with find. I'm programming a small app which 
list recursively directory and sub-directories contents. I compare my results 
with "find dir -depth", but it doesn't match ! Some files are not in find 
results. Obviously, the missing files are not found by find. But locate do.
 
 here is find --version out:
 GNU « find » version 4.2.25
 Enabled options: D_TYPE O_NOFOLLOW(enabled) LEAF_OPTIMISATION 
 
 (sorry for my bad english)
 

                
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