Problems after Merge
 

I had an IPB forum, so I manually changed the rows in the database to match the vBulletin structure. I imported the IPB forums table to the vB forum table, and my categories show up on the index, however, they aren't styled...

The "Test" section I made using the vBulletin ACP, the rest were imported.

https://vborg.vbsupport.ru/external/2013/01/4.png

And even when you click on one, there's no forum there really.

https://vborg.vbsupport.ru/external/2013/01/5.png

Even after getting rid of the "NULL"'s below and putting in a clean_title and description, it looks the same.

https://vborg.vbsupport.ru/external/2013/01/6.png

Is this maybe something to do with not making them using vBulletin ACP? All I did was import the "forum" table, maybe I need to update something in other tables as well?

You didn't use ImpEx to import the information?

Did you try Maintenance > General Update Tools > Update Forum Information?

Did you try editing a forum in the forum manager and just saving?

No, it was manually done. Impex doesn't work for my IPB version.

I did try this, yes. I also edited a forum in the forum manager, and once you edit it, the forum appears on the index, but it's unstyled (like you see above).

You aren't using a default style, so it's hard to see what is up. Use a default style. Find what template is being used for those listings that is different than the one being used for the vbulletin created forum.