That's an excellent question.. honestly, there shouldn't be a difference, so let's help either narrow down the confusion or find the bug. Hopefully, it's the first
First, make sure you're running JFBConnect 4.1.2. That has a few fixes for the template settings for the Page Tab.
Next, make sure you've created a specific "Style" for your new Beez20 template in the Template Manager. When you select a template from the Page Tab area of JFBConnect, you're selecting a specific 'style' to use of a template, not just the template itself.
Finally, edit that style in the Template Manager and make sure the "Template Colour" parameter is set to "Personal". That's what loads the personal.css file.
Let me know if everything above is already set that way (or if you're thoroughly confused) and how it all works out.
Thanks,
Alex