Duplicate entries in update-alternatives

Duplicate entries in update-alternatives

I have two entries for vim when I input sudo update-alternatives --config
editor
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/local/bin/vim 100 auto mode
1 /bin/ed -100 manual mode
2 /bin/nano 40 manual mode
3 /usr/bin/vim.tiny 10 manual mode
4 /usr/local/bin/vim 100 manual mode
Selection Path Priority Status
------------------------------------------------------------
0 /usr/local/bin/vim 100 auto mode
1 /bin/ed -100 manual mode
* 2 /bin/nano 40 manual mode
3 /usr/bin/vim.tiny 10 manual mode
4 /usr/local/bin/vim 100 manual mode
Why does this happen and how can I remove it?