Copy/Paste Issue

Hello ! 

I've got some issues with the function insert bloc. I have three files which i want to put together, one plan view and two cut view. When i insert the first cut view on the plan view file, it's okay but when i insert the second cut view. There is a bug and i've got the first cut view sometimes mixed with a part of the second cut view. 

Do you exist an other solution to merge all my files ? 

Thank you