I don't really know. If you hold the cursor over the field in the conversion settings, a tooltip gives some explanation. From that, I assume it is some sort of memory limit in the version of ADE that Kobo uses. The other thing is that there were some strange coding in the epub you uploaded. The rendering engine might have stumbled over those and not recovered. It is probably a combination of a few things and reducing the generated file is removing one of the stresses.
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