I can setup the Tranalation-Manager back to “Use translation Manager” to help you check it out.
From the other side: how do you set up your system to include the pagebuilder in the translated page?
At your testblog it seems to workd. Or did you scracth-build the pagebuilder-modules at the translated (german) blog-entry?
Did you need to specially configure the WPML-Plugin or did it just work out of the box right after installing WPML?