If you have not previously done so already, Would you be able to go to our AnswerHub and post this issue so that it be looked into further? You can find a link to our AnswerHub here: https://answers.unrealengine.com/index.html
Also, Could you follow this post so that we can immediately look into issue: How do I report a bug? - UE4 AnswerHub. This post will provide a template so that we may better assist you with your issue.
Any additional information that you could attach will greatly appreciated. Thanks and have a great day!