Is the line on the end or in the middle of the cutting units?
If the line is in the end of the cutting unit a golf course here in Sweden had the same issue with there Eclipse 322.
They are using broomers on there cutting units and when they are installed you should have a counter weight installed on the same side as the drive belt for the rear roller brush.
The weight of the cutting units became wrong when you turn the machine on the cleanup pass.
I don´t know if you have broomers but it could be the same issue with or with out them installed.
If the line is in the middle of the cutting unit you have a little more difficult problem with several different proposals and solutions.
I hope you understand my poor English
