Yes, sorry we didn’t suggest that – that works without a doubt, we were looking for a general solution, because this shouldn’t happen. We will soon update the theme and hopefully, the problem will go away and custom CSS will not be needed.

No, if the logo is OK – then I do not need any additional access. The fix (and the only thing I did, actually) is to increase the size in pixels of images used in post thumbnails. Then, after the images are regenerated with the plugin, WordPress starts using better quality versions. It is done in functions.php. I just changed two numbers, that’s it.

Yuval, I checked – the logo has nothing to do with the theme or what I did. It does, however, have something to do with your server settings. You see, the logo on the frontend is displayed with a trailing slash. But for some reason (server settings) your images are only displayed when there is no trailing slash. It works like this: https://ozrider.com/wp-content/uploads/2019/10/OzRider_Bk_web1_3500x2100.png, but doesn’t work like this: https://ozrider.com/wp-content/uploads/2019/10/OzRider_Bk_web1_3500x2100.png/. So my solution would be to try and put this into your .htaccess:
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} /$ [NC]
RewriteCond %{REQUEST_FILENAME} .*\.(png|jpg|gif|jpeg)$ [NC]
RewriteRule ^(.*)/$ $1 [R=301,L]

This should work, but I do not want to try this without FTP access. The access you gave me leads to an empty directory instead of your website, so it is of no use, unfortunately. Try the solution I’ve given. Talking to your hosting company’s support is also a good idea. I will stress out again – this thing has absolutely nothing to do with the theme nor my changes.

Unfortunately, not yet. Please upgrade your PHP version to 7.2. also, Customize doesn’t work, 403 Error. There are other PHP errors as well. When you switched to the new PHP version, please provide FTP access as well. Thanks.

Hi. This is so by design. Should you want to have the sticky menu on on mobile, you can add this to the custom CSS:
@media (max-width: 767.98px) {
.sticky-header {
display: block;
}
}