Board Thread:Support Requests - Getting Technical/@comment-665695-20150501171019/@comment-452-20150501173608

You are correct, there appears to be a 10 category limit.
 * I tested with the "Volt Guides" category, by removing one category above it until the "If you don't have volt your playing it wrong" was displayed.

I looked at the source, but can't determine what is causing this limit. I advise reporting this to Special:Contact, and asking if the limit can be increased.

I've tried to list more than 10 categories before, but didn't noticed the limit, thanks for pointing it out.

edit: Found the cause, it's hardcoded on line 53 of BlogTemplate.php.

Reporting it is still a good idea, and it's an easy fix, but it's a code edit rather than a setting edit, so it might take a few months of internal discussion before they change it.