I'm not seeing those issues on your server. I can copy/cut/paste fine and I could use your blueprint as well. I saw some delay when placing it, but the blueprint did show up and placed.
Did it happen when there are many other players on the server?
"It happens quite often"
I think I need some concrete exmaples for this .
Does the right click issue happen once every few actions or every couple minutes? and which action might cause the issue the most?
If you could record video to show what you were doing when it happened, that might be helpful.