Unit duplication bug

[ebigunso]

I am playing the vanilla Civ5 with Japanese and I have encountered this glitch.

Spontaneously one of my ship units duplicated, and created two units of the same type (it was a Trireme in my case) and after that the original one made it's preassigned move while the duplicated one stays in the spot and waits for a new order.
Moving both units around after the bug encountered no further issues, except this duplication happening again to one of the two.

I will wright down the game settings and OS below.

OS: Win7 64bit
Game: Archipelago(Huge), Russian empire, Difficulty level4, randomized temperature and rain, Japanese version from Steam
Bug occurred around turn 150.

edit: Turns out it was more a teleportation rather than a duplication. I found one of my units elsewhere missing.

 

[Browd]

Teleportation of ships most commonly happens when the ship is in a city that is being razed. Was that the case here?

 

[ebigunso]

nothing much as I remember, those ships that teleported over was in seas nobody held. It was quite far from it's ordered destination, maybe that was a problem? I don't know.

 

[NiceOneEmlyn]

Sounds to me like an open borders agreement that was cancelled.

 

[ebigunso]

I don't think so, as it was from like 20 tiles away.