Need Help Repeat Line is shown up randomly.

Hello.

I am using Mimaki JV33-160A and Wasatch 7.6 Rip.

I have a problem with repeat line shown up in printing.

I would like to tell you with some example.

Here is a pattern.(In addition, the pattern size could be changeable according to a pattern type.)
And the media width is 1500mm.

In the layout tab of wasatch rip, with using smart nesting, the pattern is layouted properly.
(At least, it's properly located in display monitor.)

But when printed out, there's a line along to the media feeding direction which is located
in repeat position.(For special case, the line could be shown along the the scanning direction)

According to the pattern type and size, the line location is random.

When I edit the pattern to join patterns in Photoshop and didn't use the wasatch rip fucntion
like smart nesting, there's no line shown up.

What is the problem? Is there any mistakes I have done with using smart nesting?