Orthographic doesn't respect the default character rotation of -90 degrees. This is reflected when viewing the Third Person character in Right/Left and Front/Back Orthographic views.
This issue was reported and tested in 4.19.2 (CL-4033788). This was reproduced in 4.20.2 (CL-4302132) and Main 4.21 (CL-4305553)
Results: When Orthographic View is set to front/back, it will show the character from the right/left.
Expected: Orthographic View shows the correct orientation when selected
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-63221 in the post.