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jmf92 Ah ok. I understand now. I don't follow those manga at all so I can't be specific, but there are 3 possible reasons
1) The scanlation groups don't allow uploading their releases on Mangadex. If you search up the mass groups leaving Mangadex incident, you would see the list of groups that don't upload on Mangadex. I think this is likely the reason.
2) There are official English releases of those manga, and they can't upload fan-translation of the chapters that haven't been released officially, as per the rules.
3) The chapters uploaded on other aggregator sites are official English releases (which is the case for a lot of manhwa series, or popular series like Black Butler, Goblin Slayer etc), and since Mangadex doesn't allow official releases upload, they are not here.
Hope it makes sense. Again I think likely it's reason number 1, just check the scanlation name and see if they belong to groups that left Mangadex and don't upload here ever again.