I tried to load my 30 round long mag for SG5K and I can't do that. Although it shows there is another short mag is attached, the actual gun model doesn't have a short mag and I can't really take the short mag out either.

I've only see this bug for once, yet this bug is on multiple SG5-Ks. I can't load any of my mags for those SG5-Ks that I found.