Robot does not move like rviz shows [closed]

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Hello everyone,

I have a problem when I try to plan a path with moveit and rviz. When the calculation of the path is ready and rviz shows the movement that the robot should do, the robot start the movement, but not like the rviz-simulation. Sometimes he doesn't do the correct movement. Instead, he does a strange movements with his last joint. Normally he can reach the final points, but the movement inbetween is strange. Do you know why maybe?

Thank you!