I also recognize this, but just ignore it, and live with it like all bugs in a game. As for the EAS-4 Strut, place it on the part you are going to connect it to not the Rockomax Jumbo 64. The impossible place glitch is common you can just place it somewhere else then change it to where you want it, easy fix. For the middle "glitch" you described it could just be that you need to press "C" to disable octagonal placing "it moves the part you want to add depending on the center location of the other part". You can nudge things by holding the "Shift" key and using Q,E,A,S,D for rotation movement. Hope this helped!