what are you doing? for which MAME version? Which version of CHDMAN.exe? Which CLRMAME version
from MAME XML 0.244:
<game name="cndypuzl" romof="cubo">
<description>Candy Puzzle (v1.0)</description>
<year>1995</year>
<manufacturer>CD Express</manufacturer>
<disk name="cndypuzl" sha1="5f41ed3521b3e05d233ac1245b78cb0b118b2b90" status="baddump"/>
</game>
https://bda.retroroms.info:82/downloads/mame/CHDs/cndypuzl/
chdman - MAME Compressed Hunks of Data (CHD) manager 0.146 (Jul 31 2016)
Input file: cndypuzl.chd
File Version: 4
Logical size: 434,431,872 bytes
Hunk Size: 9,792 bytes
Total Hunks: 44,366
Unit Size: 2,448 bytes
Total Units: 177,464
Compression: zlib (Deflate)
CHD size: 15,868,976 bytes
Ratio: 3.7%
SHA1: 5f41ed3521b3e05d233ac1245b78cb0b118b2b90
Data SHA1: 21093753a1875dc4fb97f23232ed3d8776b48c06
My local version:
e:\Emulation\Mame\chd\cndypuzl>chdman.exe info -i cndypuzl.chd
chdman - MAME Compressed Hunks of Data (CHD) manager 0.244 (mame0244)
Input file: cndypuzl.chd
File Version: 4
Logical size: 434,431,872 bytes
Hunk Size: 9,792 bytes
Total Hunks: 44,366
Unit Size: 2,448 bytes
Total Units: 177,464
Compression: zlib (Deflate)
CHD size: 15,868,976 bytes
Ratio: 3.7%
SHA1: 5f41ed3521b3e05d233ac1245b78cb0b118b2b90
Data SHA1: 21093753a1875dc4fb97f23232ed3d8776b48c06
I must also say that I do only a "quick" scan each version with all the CHDs.
So please give me more information and I will investigate it.
Thanks