Importing .dig format in Scenario Editor

Hello, I have a route in .dig file format that is about 70 kilometers long and I want to load it in the scenario editor. When doing so, I have some problems, as some curves are not drawn correctly and a straight route is displayed instead. In addition, I get the error message ‘[Warning] External file is being read - number of dig. Points reduced (detected minimum, distance 0.002m, allowed 0.25 m)’. Although my X-axis advances in steps of ~ 0.1 and my Y-axis advances in steps of ~ 0.5. Oddly enough, this problem does not happen when I load only part of these curves. Is there any way to solve this problem?
Thank you in advance.