I am starting to wonder if there are browers differences, too.
The fact that when you book on Midwest Airlines website you see some E170 flights indicated as E190 is not a browser issue, of course.
However I defintely have never seen a seat map suggesting row 7 is exit row on the E170. The seat maps I see for the E170 have 19 rows of 2x2, which is accurate, and the red arrows indicating exit row (which should not be there) are in the crack between rows 10 and 11. On aircraft where there really is an exit row, the red arrowheads are not in the crack between rows but are solidly lined up in the row itself.
But it sounds like some people are seeing seating maps for the E170 which are messed-up-looking, yes? Using IE? Firefox? Other?