@Lking846 is correct. The red-tinted threads are threads which are not approved to be seen by the general population.
The wiki form in particular has a few of these, because the threads are either under review or are still being prepared. As a general rule, if the thread poster is a staff member, it should be left alone until the staff member who posted it approves it. In other scenarios, I think it would still be wise to not touch the approval status of the thread, simply because it is likely something which a higher ranking staff member should approve.