To see if you have the privilege of doing something, you should check what reported in the privilege page, whose link is reported in the drop-down menu that pop ups when you hover the mouse over your username on the top of the page.
If you see that, for a privilege, the required reputation is higher than the reputation you have, then it could be a bug, or the description for the privilege is not correct, or you didn't understand correctly what the privilege being described is.
In fact, privileges and limits being used on a site could change from site to site. To make an example, on Stack Overflow you can vote to close 50 questions per day, but in other sites (including this very meta site) that limit is 24.
Sometimes limits are changed on a specific site basing on particularly necessities; the limit on the number of questions you can vote to close has been increased on Stack Overflow because probably there are many questions that needed to be closed, but that were not closed.