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I could see the problem and initially you should disable all third party plugins and see if that can be related to some plugin. If the problem persists please contact your hosting service and check...

It is usually related to server settings/changes/quirks when php fails to process the page. I have checked your site and it seems to be working fine.

You can fix it by changing the "Ad Box Right Side:" value through the Classipress settings-Advanced.

The problem with the buttons can be solved by placing a button below the other.

Try this code that I changed to another user and see if it solves your problem.
File to be changed "sidebar.php"
...

Try shortening the text first through the language files.