Invitation links

If I make a link today it will be for 7 days
before I could make settings like that the link was for 2 hours and disappeared after that and then all the links were like that.
but now I have to do it for every link I make. So first it becomes a link in 7 days then it becomes another in 1 hour as an example after which it goes back to 7 days again. There are several server owners who reacted and want the old back