>>8070481First thing's first. Go grab the box and check to make sure its actually bandai. There is a bootleg version of the kit by Daban, which could explain it. Check the red logo on the corner, it should be bandai, but the bootleg has "Daban Hobby" instead. I cannot find a good picture of the runners from the zaku Daban kit, so I'm not sure.
Interestingly, the runner looks like the runner for the char zaku version
https://www.1999.co.jp/itbig12/10129235n4.jpg