The most probable cause of the meat getting stuck in your tenderizer is that the combs are not installed correctly. Please make sure that the teeth end of the combs are resting on the inside and between the two blade assemblies and not on the outside sections. For a clear demonstration, please see the video below, starting at the 2:26 minute mark.

Here is the direct link to the video beginning at the time mark: https://www.youtube.com/watch?v=3kYuTaySYGI&t=146s