Hmm, that's odd. It's possible that some of them might have changed their personalized settings for notifications – you can try this troubleshooter and see how it goes: https://yt.be/help/gti9 . Also if you can, ask for some screenshots from your subscribers and send them our way.
@TeamYouTube
Several of my subscribers have recently told me that they haven't been getting notified of my uploads even though they hit the bell. I am also not showing up in their recommended subscribed video feeds etc. Can you look into this?
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