Canon 5D mark II raw file conversion size blowout

I am suffering from an issue where my CR2 files from a 5D decrease in size when converted to DNG  from for example 14.4MB to 11.8MB while the 5D mark II files increase from 8.7MB to a much larger 23.6MB after conversion. Both conversions are being done with DNG Converter 5.4 using the same preferences. Any light you could shine on this for me would be greatly appreciated.

It is because your 5D Mark II files are sRAW images, not raw. (The full 5D Mark II raw files are usually over 20 MB, not ~8 MB.) When you process sRAW files into DNG files, the DNG files are stored in the "linear DNG" format, which is much bigger than the sRAW format.
p.s., these questions should be directed to the Camera Raw, Lightroom, or DNG forums in the future to get a faster reply.

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