Since this seems like you may have a somewhat complex setup, if you could zip up your project and provide a link to Dropbox so that I can download it, that would allow me to take a look and see how I could reproduce this issue on my end. If you’re concerned about privacy, you can PM me on the forums: https://forums.unrealengine.com/member.php?160394-Sean-Flint
Also, definitely let me know the results of the further tests that you are performing.