I can not change user registration mode anymore

[ciccio79]

since I did the translate to another server, my old forum, it turns out to have many problems, in addition to that of loading images of another discussion:

https://vbulletin.org/forum/showthread.php?t=326682

now I can not even change the register option (human verification) setting, from the admicp turns out to be changed but when I try to registrer it is still the same.
How can I solve this problem?