Just looked at this and it has the same problem as you show.
the only way I see to correct this (make it straight) it type out what you want and size it as needed. then click on apps and choose exploder and explode the font into individual letters at that point delete original text and edit the letter a (click on edit points) as needed.
Personally I would just delete to two offending nodes. that ensures a nice straight line between to the other two nodes.