Hi Aaron,
we have two lines SP Page Builder's, you can use SPPB 3.8.x OR SPPB 4.0.x as you like and prefer. The 4.0.x series is pretty fresh and works using only front-end editor.
As I noticed you installed 4.0.x
That's why we always suggest to check new software on FRESH Joomla installation first before saying that it's not working etc. As you know in IT there are many things that causes problems, like during the the real fire of the building.
In your case I have to ask our developer, becuase indeed whole front-end editor view is damaged, weird, I see that JS conflict first time.