I can't help with a solution, but I can say that if I set my view to subscribed, I only see my subscribed instances and nothing else, no matter how many times I page down. I can't find a setting or anything that should conflict with it. Do you have any scripts/extensions that might be somehow pulling in anything extra? I can't think of any I've seen like that, they've all been appearance-based.
Thanks for the response. I don’t have anything out of the ordinary, I think (certainly no custom scripts). I‘m a casual user with a regular Chrome browser in default settings.
It seems to be my account. I have the same issue when logging in on my phone.