Links on tabs turned into `/user/%/edit`, `/user/%/contact`, `node/%/edit`, `admin/structure/types/%/fields`, etc.
Also, the links on Administration Menu module have the same issue.

Here's what I did so far.

 1. I've cleared all cache via Admin Menu -> Flush all cache, via Development -> Performance and via emptying MySQL cache_* tables. Didn't solve.

 2. I noticed that tabs are themed by the `menu_local_tasks()` function. I traced the function to `includes/menu.inc`, where I found the following snippet, which makes me think it might be related to this function.

 

    * For example, the ancestors of node/12345/edit are:
     * - node/12345/edit
     * - node/12345/%
     * - node/%/edit
     * - node/%/%
     * - node/12345
     * - node/%
     * - node

UPDATE:
Where is `'%'`, of the above URLs, being populated? I want to be able to trace it.