PMs appearing to be sent but they weren't received...

[Elshaddoll]

http://uploads.tapatalk-cdn.com/20160727/b2aec11aa9d2b65868681f0db9b6488b.jpg
http://uploads.tapatalk-cdn.com/20160727/143b320a1f92e17a855a07058cb467e0.jpg
(Irrelevant chat) I sent my friend a pm and it appeared to be sent but he didn't receive it, the second screenshot is what he saw.
(Sorry for my low quality screenshot)
This also happened again later on the same day, but I haven't a screenshot of it.

Sent from my MediaPad 7 Youth 2 using Tapatalk

[Potato is me]

If this was happening btw me and my friend yesterday... im pretty pissed rn >:(

[bjc535]

Yes I've noticed it also! Happens often

[Fyrce]

Oh! That could explain why sometimes i think people are ignoring me. Ill have to rememeber they might not have received chat at all.