When reference scale is changed it causes Line Styles to scale
When scaling a Reference file in Reference Manger, Custom Line Styles which have their own scale in the Reference file, scale up or down by the same amount, which can be unwanted and be out of proportion with the other elements in reference and master file.
Line Style appears correct
Line Style appears scaled
There is a setting in the Reference Manager dialog box called 'Scale Line Styles By Reference Scale', toggle this to change Custom Line Style scale and display in Reference. See image below attached showing this toggle.