This is a known issue (UE-4659) that has been submitted to the developers for further consideration. I have have provided a link to the original issue below. You can check there for future updates. I will be sure to bump the community interest for this issue. Thank you for your information and time.
It would be really awesome if people who are experiencing this problem could upvote the issue in the issue tracker to help let Unreal know that we’d love it fixed!
I upvoted it, it would be nice to see a REAL fix, but there is a way to get around this for now. Make your elements on-screen, then make an animation, and on the Frame 0, move them off screen. They’ll start the animation in their proper place and won’t get clipped.