I noticed that the reversing gear on the left side of my Decapod moves up and down whenever i run it despite the fact that the rod is meant to be static, this is not happening on the right reverser which stays in place like it's supposed to. Both rods are between a pair of brackets that i think are meant to hold them in place but something is causing the left rod to move independently. Other than that i have no problems with the locomotive, can somebody give me some advice?