My guess as to what is going on: The Cleric page (to pick an example), with its list of subclasses, is "owned" by Roll20. DTE is a third party DMs Guild product. They can add hooks in for things like subclasses, but do not have edit privileges for that base Cleric page. Thus, their subclasses will appear in the subclasses list of the compendium, but not on the Roll20-curated Cleric page. The same would be true of the other classes. Again, this is a guess based upon my experience with how the compendium is set up.