Issue with plotting vectors

Hello,

I'm sure this has been answered before, but I'm wondering why I am unable to plot two vectors while I am able to plot another. I'm unsure of the tecnical reason why. I would appreciate any help with the issue. Page 3 currently has the plots that are not plotting correctly. I have also put some plots on page 4 showing that I don't think it should be the fault of a range being used.