I'm very new to linux and vim, my laptop computer is windows and I'm using ssh to access my school's unbuntu linux in the terminal. The funny thing is, when I use shift+insert through external keyboard to paste from clipboard(in vim), things works very well. However the laptop keyboard fails.
I solved the copy/paste problem by changing the options of terminal( https://unix.stackexchange.com/a/600067), but the keyboard thing is still confusing me, just don't know why would it happen.