Problems with styles

Hello. I have a problem with styles of my site on registration and other plugin pages (forgot password, etc). They are being changed on those pages. Font-size of the page title, subtitle and the top menu are made small. For examle, on the main page of the site https://totalforex.pro there is a page title with font-size=40 and on this page https://totalforex.pro/lostpassword/ or this one – https://totalforex.pro/register/ it is about 12 or 14px. I searched reasons in CSS plugin file, but there is nothing that could affect this. Could you please help me with this issue!

The page I need help with: [log in to see the link]