Try this:
1) Disable all plugins temporarily and then do your stuff and enable plugins again. One of the plugins might be causing this.
2) Custom home page can also be set by going to Dashboard -> setttings -> Reading
If you are using a old version use latest version of everything theme and plugins. Latest version of theme can be downloaded from https://themonic.com/member-login/
If you are using the latest version of everything and want us to check, email login info and site details to [email protected] with link to this thread.