iMessage "delievered" and not "read"

Hey, sorry if my English isn't very good.

So I started messaging with friends from iMessage which I never did before.

they were sharing their screen thru another app and I messaged them and I saw that when I send them a message it says "Read" and not "Delivered".

I looked it up online and everyone who had this problem said to check the messages settings, so I checked it and the "Send Read Receipts" option was already on, I don't know if it's a bug, but I just don't know what to do.

Sure, I can ignore it but I just want to see if the one I sent a message actually read my message. Thanks!