Line weights in PDF showing thicker than in Layout/ Plan

[FairOaksStudio]

I am having some troubles and have looked everywhere online for a solution but can't seem to find one. 

 

I send my elevations and cross sections to layout and the line weights look fine to me. I go to print to PDF and suddenly some of the elevations line weights are much thicker than before. Seems to be very random as some elevation lines are normal still. I haven't touched anything but received an error "#272032247 - The line weight scale in your layout is not the same as in the view being sent to layout. As a result, line weights in that view will not be correct. Line weight scale can set in the Drawing Sheet Setup dialog." so something must have happened on my end. 

 

Any help would be much appreciated! I am desperate

Note: I did have to remove the program and reinstall it a few days ago.