Lines don't show straight on bounding boxes & text?

 I'm having an issue across all of my InDesign documents in the last month or so where my lines aren't straight? It's affecting text, accuracy of object placement - almost every thing I do there is a hesitancy where I'm not sure if it's in the right place -

It seems to go away after I go into preview / presentation mode and then back to 'normal' but it doesn't stay fixed, next time I scroll the page it goes back to displaying inaccurately.