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Player input on the Client while Ejected during PIE will show on the Server (Editor) viewport and not on the Client window.
Reproduced in 4.7.6 binary, 4.8.2 binary and Main (//depot/UE4/Promotable-CL-2623997)
1. Open a new Third Person template project
2. PIE with Players set to 2
4. Give the Client window focus
5. Move the character on the Client
The Client window does not update the position of the character, but the Server window does.
Not really sure. It seems like player input shouldn't be accepted on the Client window during PIE while Ejected.
Head over to the existing Questions & Answers thread and let us know what's up.