Homiru

Hello, i have a question for a mission given by Kerbin World-Firsts Record-Keeping Society, mean by main quest in Career mode. just i clear Orbit Kerbin mission, i expect Explore Mun to next mission. but i given Explore Kaxor mission instead of Explore Mun. i get information in KSS wiki which is Kaxor is another system and it can't be reach using THUD booster and Swivel LF engine. is this normal situation in KSS? or i have a mod compatible problem? i run the KSP in steam, previous_1.4.3 as KSS manual said. and using other mods as below, any help would be welcome and sorry for my kerboomed-english