Flagship Weird glitch

[HazelCyan]

Hi, I'm new to the forums and my pirate name is Guthix, Notoriety only 27.
I encountered a amazingly weird glitch while sailing with my friends:

Me and my friends got hold of a flagged colossus, just when we boarded it someone else used firebrand and sunk that flagship when we landed!!! Then we were in an unknown land of clouds and nothingness and that flagship with no people on it. The death/ Jail music kept repeating, i talked to my friends but they all clicked F4 and logged in again, i swam around the area noticing when i was swimming i was spinning around at 360 degrees! Did anyone else have this glitch before?