Line type scale

Hi,

Does anyone have any ideas what is going on here. I have set the LTscale in model space to 25 and the line scale to 1. in paperspace, the PSLTscale is set to 0 and Vport scale is 1:25 so the dashed lines should look the same in both spaces (See attached) but they don't. I am sure there is a scaling issue somewhere but can't seem to find it. Units are decimal but it may be that an imperial conversion is happening somewhere.

thanks in advance