Tube filter is giving opposite scaling

Hi everybody,

I am showing the force chains of a granular assembly obtained from LIGGGHTS using Paraview.
Problem1: Scaling is occurring in the reverse order, i.e. the weaker force chains are thicker and the strong force chains are thinner.
Problem2: Horizontal lines can be seen joining the lateral boundaries.

PS: I am using periodic boundaries at the lateral boundaries

Any suggestions will be very helpful.

Thanks,
Sounik