Large White Space Above Site Header

After recently updating to the new WP version and updating a few plugins, my site (draherin.com) is now displaying a bit strangely. When viewing the site from multiple desktop web browsers, there is a large amount (a gap) of white space between the pre-header area and the actual header. I have looked through all of the settings, deactivated plugins, but I cannot figure out what is causing this to happen.

Also, whenever I have made any change to the settings, the site seems to freeze in the “saving…” mode. The media library page won’t even load.

Can anyone help me out here? Thanks!