I have uninstalled messenger but whenever someone PMs me it says "delivered"?

So basically I uninstalled messenger. There is this friend of mine who messaged me today on WhatsApp and said that whenever he pms me on messenger it says "delivered" and not just "sent".

Why is that happening? I don't use fb on PC or anything else like that, I stopped using it completely and people think I ignore them. Is there any way to stop that?
I have uninstalled messenger but whenever someone PMs me it says "delivered"?
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