1.3 random unit refills...

[Fisherking]

I run mods at the moment, but I had this happen on vanilla.

The way I had it happen in vanilla was when I had built Life Guards as Prussia, then switched to Republic, which transformed my Life Guard infantry into oversize Line Infantry (they were normally 120 men, they were up to 150 men I think). It is reproducable. I don't know about other situations that can cause this though.

I am not sure that is a bug at all. I think it is a feature with regards to changing guard units into line units. Guards often had double the number of men in their battalions as other units, and while they are renamed you may find that they still have better stats than other line units.

[resonantblue]

Yeah, I'm actually not sure if that's a bug or a feature, but it's similar to the behaviour the OP was talking about so I figured I'd post it.