Hello,
I agree with Vern, it would be best to contact CSD with such a question. Based on what I see, to me it appears the line at 45 degrees is already not on the grid defined. If you have an object off grid and move it, it does not snap to the grid but keeps it's relative distance from the grid. So if I place a line on a 10th grid, then change the grid to 20th, the line will move in 20th increments but remain on the 10th grid it was placed on.
if this is your issue, this is not a bug but by design and it's up to the user to first snap the object to the grid if they wish it to be on a new grid.
Regards,
Jerry Suiter
Product Marketing Director Xpedition