This should not happen because for axis boundaries, the solver assumes 'reflect type' boundary condition by default. You may want to check this section of the user's guide: 20.4. Setting Boundary Conditions for the Discrete Phase (ansys.com)
If you are not able to access the link, please refer to this forum discussion: Using Help with links (ansys.com)
Check if correct DPM boundary conditions have been assigned to the wall boundaries.
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