"page_title_text" does only partial change


I have changed my title using “page_title_text” and only half my title has changed.

old title: mysite

old title displayed: mysite - Home

new title: mysiteB

new title displays: mysiteB - Home

I cannot seem to get rid of the “- Home” bit. It has been this way since our site was developed and I’de love to sort it out if anyone can help.