large files

[xtaylord]

I seem to be getting hits repeated when parsing large files, with the same index shown.
I was adding my results to a dictionary using the index as the key and noticed I started getting exceptions with large files as entries had already been already with the same index value. The index given for these later matches also seems incorrect and does not match the offset within the binary file I'm searching.
Small files seem to work fine, with the correct indexes reported and confirmed using a hex editor on the source file.
Thanks