Gazebo Model does crazy things

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Hello everyone,

I hope i'm right in this forum if not i will reopen this question at gazebo.

So my problem is that my own build robot in Gazebo just drives siteway's or straight without any command given to it. This happens as soon as i unfreeze the simulation(over the play button). I guess its because the tires are somehow off.

I looked everywhere in the Internet but the Align option dosen't work properly and somehow no one has this problem.

specs: Ubuntu 18.04, ROS Melodic, Gazebo-9

EDIT: GITHUB REPO with the ROBOT-UDRF file: https://github.com/DavidSchmidt1/Indu...

Help would be appreciated.

Regards, David