Yes It is easy to get Maya's view panels confused. In the future if you do not wish to delete your preferences.
(1) Goto 4-view it's in the toolbar on the left. Then in each panel goto the panel drop down and you will see "perspective" and "orthogonal". In each of the four view panels select the correct view.
(2) If you accidentally messed up one of the four standard views you can go to bookmark > predefined views while in the offending view panel and pick the correct predefined view.
"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675