Images randomly disappear on right-click as well as other strange behaviour

When I right-click on an image in gnome-photos some images disappear and then it acts all very strange, it doesn't even allow me to close it because the window-control buttons are gone so I either have to close it through the Activities Overview or through another means. I have attached a screencast of what I mean (when my mouse goes over one of the images at the beginning and they all disappear that is when I right-click).

This makes gnome-photos completely unusable though because even when left-clicking after doing the fatal right-click it doesn't work as it should, or really do anything but make the image I clicked on temporarily disappear...

I have also attached the Terminal output.

This issue is present on Ubuntu GNOME 15.10 with GNOME 3.18, as well as Ubuntu GNOME 16.04 with GNOME 3.18. But only when using the pre-installed Numix GTK+ theme, with Adwaita it is fine. Though the issue is not present when using Numix on Ubuntu GNOME 16.04 with GNOME 3.19.