Why does my mate keep on following me everywhere?

Why does my mate keep on following me everywhere? Whichever cat I am, he or she follows who ever I’m being. It’s most annoying when they are getting themselves killed by a greyhound or border collie then I can’t use them or I have to join the fight. When I’m black Mocha, sneaking around by the digs with his killer instincts at night, I just see Star strolling straight out into the yard. And it’s also that sometimes Star wants to go down to the beach, With her enhanced senses and healing boost, miles away form our house, but when she gets there, the view is worth it, and then she’s hunting down some prey, like an eagle, and Mocha comes running all the way the way from our house. And when ever I try to send them home they run on the spot for three seconds then stay exactly where they are. Even when they already are in the house and I tell them to stay at home (Both Mocha and Star are incredibly guilty of this) they follow me out. And Star is at level 14 I’m worried that the kitten will do the same as his/her parents.