I have this problem when I try to attach KW engines Both fuel tank and engine from KW Stock fuel tank with KW engine Stock engine with KW fuel tank Someone knows why this happen? Mods: Crew Transfer Deadly Reentry Distant Objects Docking Port Alignment Engineer Redux FAR (Ferram Aerospace Research) Infernal Robotics KAS (Kerbal Attachmnent System) KJR (Kerbal Joint Reinforcement) KAC (Kerbal Alarm Clock) KVV (Kronal Vessel Viewer) KW Rocketry LTech Real Chute TAC Life Supp TAC Fuel Balancer Texture Replacer VNG Parachute Real Chute Stage Recovery USI Survivability Pack