Sorry for necroing this thread but I just had a very similar issue and thought it might be good to share what turned out to be my problem and solution in case anyone else comes across this.
Note that I’m just doing it all in C++. The issue was that I added the bindings in the constructor so this meant that not only new instances of the object were binding but so was the default object, the CDO. Moving the bindings to an “Init” function and calling that in the owning object fixed the issue for me.
I’m not sure how this might happen exclusively in BP though.
More can be read about CDOs here: What is CDO? - Development / Programming & Scripting - Epic Developer Community Forums