particles penetrating mesh

hello,

I was used to perform simulations using 3 different meshes, one of them is an auger, and the simulations were running normally, but when I extended the length of the auger I was using, the particles started penetrating the auger and filling it from inside. knowing that I kept the same input script I was using before except for importing this new mesh which has the same element size as the old one.

Please find attached two pictures of the two cases, hoping to have any help from anyone.

best wishes,