IMessages aren't saying delivered?

So I just noticed this problem yesterday & I'm confused on it Ok so yesterday I was texting someone & all of a sudden the messages didn't say "delivered" I know that means it's just trying to deliver either the person don't have signal or phone is off but the thing is that the person would reply back 2 minutes later & they have their "read" switch on so everytime I text them they reply back in less than 2 minutes so I know it's not the message trying to get delivered because the person receives it 3-5 minutes later & REPLIES so my messages just aren't saying delivered anymore it goes straight to read So I texted a 2nd iPhone user & it was doing the same thing again so I figured it was just my phone then until I asked them if there's was doing the same & they said theirs was doing the same thing with 2 people she texted so I figured it was just iMessage messing up then but I texted a 3rd to ask if it was happening to them & they said no but when I was texting the 3rd person all my imessages said delivered so I'm confused does anyone know why this is happening? Is it just our iMessages on certain people or is it our phones or what's going on? One person says theirs say delivered when they're texting me but mine stay blank & we text each other back in less than 5 minutes most times so it goes through it just don't say delivered then the other one says hers stay blank when she texts me & mine stay blank when I text her too but they receive fine I less than 5 minutes… Help!

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