hello how would you deal with someone who is your kintype, resolve it etc? some friends of mine are having this problem

I’m not sure what there is to resolve here. If by your kintype, you mean they are the same specific character as you (for example you were both Legolas) there is nothing wrong with this unless one of you is asserting that there can only be one Legolas. Then you’re wrong. Both of you can be the same kintype and yet have had wildly different experience, beliefs and memories, yet each equally be for real, Legolas.