Issue with creating duplicate graded surface

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Hi all,
I'm currently doing my topography phase for my building, I've set out the topography however i need to create a duplicate layer of the existing site to make room for the new building which i'm having issues with . This is the link to the tutorial my lecturer gave us to use (the whole scenario of what i need to do is explained a lot better compared to me) https://www.youtube.com/watch?v=zy0EFrlrUA4 i followed his instructions to the bone yet on mine i can only see the outline of the existing site even after i supposedly reshape the duplicate layer where as with his you can see the exisiting site in black dotted lines and his new reshaped site in the blue dotted lines. I'm also having issues cycling through these 2 views and can't even select the whole site properly (it only selects small random sections when i click on it). I've attached my Revit screenshots as well. He uses the 2017 model of Revit whist i'm using 2020 however he claimed there would only be negligible differences between the 2 and i don't believe it was cause such a large and irritating issue like this, or have i in fact done the task correctly and i just haven't realised - which i highly doubt. Thanks in advance everyone.