@Zandothar: Hey an welcome 
You first question is something that has been reported before. It is a pretty weird bug that I have no idea how to properly fix in the current build. Thankfully it is not an issue in the coming update, and it is also easy to prevent it from having an actual in-game impact in the current build. Here is what I answered last time this was asked:
As for your health bar question, I don’t think what you are trying to do is solvable by using two separate billboards, as they will overlap in strange ways. One way to do what you intend is to either make a more complex material for the health bar, so that is able to display both or, as you suggested, to use a 3D widget.
I’d probably go for the second solution, as it is easier and more flexible. The reason I’ve done it this way is so I do not need to have all units constantly running tick events, for performance reasons. However, this is very unlikely to have an actual performance impact for most games.
To rotate your bars appropriately to face the camera you’ll need to enable tick events in the unit blueprint and rotate the health bar to face the camera every tick. I’ve actually done so in one of the units in the toolkit already. Have a look at Unit_VR in Maps/VR. Here is the relevant bit of code:
