Problem settings saving

Hi,
I have a simple page made on the theme of Zakra.
There is a problem saving the appearance changes.
For example:
– I change the font in the header (type, format), save the changes, then refresh the page and no changes can be seen. ( I can see saved changest when I open menu Custom Menu)
– I don’t want to display Site Title and Tagline but always appears on the page regardless of whether I check or not box “Display Site Title and Tagline ”
– I set up the logo and it appears on all pages without one page (the settings for each are the same).
I have a request for suggestions as to the reasons.