Some of node links of content types are corrupted
I've hit redirecting-to-front-page nodes in the past when I've stripped out use of the PHP filter input format. Turns out there was conditional logic that sometimes printed javascript redirect code.

Does the pages in question use the PHP filter format? If the admin blocked eval() perhaps it could stop execution of PHP and just render redirect code?

You can check disable_functions value in /admin/reports/status/php to confirm your suspicion about disabled functions.