Well It looks like you just have to edit a sketch and hit "normal to" to force the software to fix it. Very odd that opening can closing had no effect. Saw someone posted this on another forum and they had no solution. The software basically acted like the bonding box was a million units large.
I did not really see your issue. What are you display settings for dimensions and notes flat to screen (although did not change anything on my computer checked or unchecked). In document properties have you tried changing drafting standard from ANSI to ISO? Standard VAR question: Did you reboot your computer? Have you tried running regedit, rename key SOLIDWORKS 2018 to something else then restart SolidWorks? Unfortunately, I do not use the educational version so I do not know how different it is from standard SW.