There's a chance they blocked you in a moment of anger or impulse. And now, they can't resist seeing your stories because they still care about you, at least on some level. They might be too proud to unblock you directly but still want to keep an eye on you.
She might be in a state of conflict. On one hand, she blocked you perhaps because of a fight or some negative feelings. But on the other hand, she's not fully ready to let go and still wants to keep an eye on you. It could also be that she doesn't want you to be able to directly interact with her, but she enjoys passively observing your updates.
Well, he might be conflicted. He blocked you, perhaps because he was angry or wanted to create some distance. But he still watches your stories because he still has some level of interest or attachment. It's like he's not fully ready to let go. He could be secretly hoping things will change between you two in the future.
You could try to respect her decision to block you and just continue living your life. If she's interested in your stories, she might come around on her own. Don't push the situation by trying to contact her through other means.
Don't overthink it. Just continue living your life as normal. If it bothers you, you could consider making your stories private so he can't watch them anymore.
There are several possibilities. They might be in a state of confusion. On one hand, they ghosted you, which could be due to various reasons like fear of commitment or some personal issues. But on the other hand, they still watch your stories because they can't completely cut off the connection. It could also be that they hope to see if you're doing better or worse without them, which is a rather self - centered reason.
It could mean that they're still interested in your life in a way but don't want to be publicly associated with following you. Maybe they're trying to move on but can't help being a bit nosy.
It could mean a lot of things. Maybe they're just curious about what you're up to. Or perhaps they still have some feelings for you and are using this as a way to stay connected in a small way.