This is natural. Ping is when a server pings you to see if you're still connected. Pong is where you receive apong reply from the server after sending it a ping. Sodon't be alarmed, it's mIRC and the server taking it's course.
You can hide these byAlt+ O > IRC > Options > hide Ping? Pong! event.
A good way to understand them so you have the right way round is. Ping? the ? is basically asking you if your connected. And the ! shouting out loudly that you are.
-Andy
