Object mode shows weird lines

So here is my model in Edit mode vs Object mode. Why are there weird orange lines in Object mode? Seems harmless but is it a bug?

How is this made ? Knife, Boolean? Looks as if you have some n-gon hiding somewhere. Have you removed doubles (w-key menu)?
In face select mode, look for these markers if there are some in not expected places.

If you have object properties -> display -> wire option on but haven’t also checked ‘draw all lines’, that is what it might look like.

(Old screenshot, both are on the right hand side now)

Thanks guys! I used Knife tool primarily and I think I had double faces. Responses are much appreciated!