Well I took a peek and you have forums 1-17 but forum 11 and 15 are gone.
I would surmise that they were deleted at one point in time .
Because the current version still allows you to disable or delete a forum.
I am not aware of any version that allows you to number the forum.
A net new forum is going to be assigned the next number above the last highest number regardless if it is active or disabled or deleted.
Back in the classic days it was able to delete a forum but was suggested to never do so.
It was recommended to disable the forum and recycle it for new use.
As far as sort order when viewing in the control panel it goes by something like forum title then by date added then I think by category name.
Now the order field does jump about quite a bit.
As Giz noted that is normal so if say you want to add a new forum and be the second one displayed then
in your case it is 5 and 8 for the current sort.
So you could add a forum and set the order to 7 or 6 and it would be the second forum displayed for visitors. Instead of having to reorder every forum if they were say 1,2,3,4,5,6,7 etc. every time you add a forum.
So to answer your question. Yes you can reorder the display anytime.
Just bear in mind that you may need to change the order on multiple forums if they overlap.
Last edited by Ruben; 10/11/2015 1:43 PM.
