Gallery and Theme

redunionsalon.com has used the same theme for a long time, and we added a photo gallery a few months ago. No one made any changes, but recently we noticed the photo gallery stopped loading. The little pin wheel just spins forever.

I asked for support from the photo gallery people at this thread:

https://ww.wp.xz.cn/support/topic/my-gallery-has-stopped-loading-pictures/#post-10819575

Apparently they say the problem is with the theme trying to load using http, instead of https. They said I should ask for help from the theme support and show this screen shot:

https://gyazo.com/00622997720c128b37be79d424164c95

Please help

The page I need help with: [log in to see the link]