That happens to me as well, and I'm pretty sure every MineChat user. You're probably muted due to the automatic message '(Username) has connected with (device) using MineChat' that appears when you log onto a server.
Not sure if you are experiencing this like me but MineChat keeps kicking me to Hub. I read on it's review another person had the same problem. ;-;
That used to happen to me when someone killed me when i was on minechat. i think you have to turn on "hide server messages" in settings. I think
It's minechat's automatic messages that the server senses as spam. Just disable any intro messages. If you don't mind using 1.7 use MC Chat for you Android users. It barely has problems and was the Android version of minechat before.
This happens to me sometimes , but it's because Of the intro message , it's kinda hard to do it lol only happens very rarely it's the only "offence" I've ever had on squad , and it's not my fault ;-;