Sun Path

[Tim1970]

I have been using Revit for over 10 years but have only just noticed this. I have 2 floor plans set up for Level1 & Level2 floors and when I turn on the Sun path it appears in a different location on each plan (as it does also on my site plans, shadow plans etc also but hope to solve floor plans for now). Also you will notice as per attachments the sizes are different even though they are both set as 100%.
Why is this happening and how do I fix it?

cheers - tim