My troops fight against my own and my subject's troops on the frontline

[Lapkonium]

Integrity​

I have verified my game files (on Steam)​

Yes

I have disabled all mods​

Yes

Required​

Summary​

My troops fight against my own and my subject's troops on the frontline

Description​

I was fighting a campaign in Niger, after the British left the front, my forces started to fight eac other! As you can see on the screenshot, my subjects' and my own armies are attacking my other two armies!

Happened once, but it was very silly.

Steps to reproduce​

Not sure

Game Version​

1.8.6

OS​

Windows

Additional​

Bug Type​

Other

Save Game​

Attachments​

Player Pain​

3