Hello Laurie-
Thanks for reaching out, and thanks for using the Post and Page Builder for WordPress.
I took a look at some of your galleries, and I see what you mean. The first lightbox that pops up, the one with the strange title, is actually the one provided by Responsive Lightbox and Gallery (RL&G), and the second one is the one provided by the BoldGrid Gallery plugin.
If the second one is the one you like better, then I’d recommend sticking with just the BoldGrid Gallery plugin, and disable RL&G.
I wasn’t able to recreate the same issue with the strange title, however. That should be the image’s “Title” (data-rl_title means “Data for Responsive Lightbox Title). If you decide to stick with RL&G, I’d recommend reaching out on their support forums about that issue.