Has your site always been https or did you change that recently and, if so, is that when the problem started?
i ask this because when I try and change a title on your staging site I am being warned that I am sending unsecured data which suggests that SP is not 100% aware that the site is https.
[Update] Well something in your setup is out of control... The site is using https but neither the core WordPress nor Simple:Press are aware of this. Just check in the WP Admin Settings > General to see that both urls are set to http. Same goes for the forum > Integration > Page and Permalink settings.
I am not, at this stage, saying that this is the cause if your problem but I would not be surprised if this is the case. Especially when you add in the use of a plugin like WordFence.
I don't know how your site is running under https without WP being set that way but it is and that is not good and needs sorting before we can go any further. I think @mr-papa - who is more knowledgable than I in this area - will agree.