I'm not entirely sure, but:
Try using "sv autojoin off/normal" OR:
set allow_match 0 // set to 1 to enable the "match" command for clan matches
set matchmode_cfg "matchmode.cfg"
set publicmode_cfg "publicmode.cfg"
Try to delete these lines, publicmode.cfg contains "sv autojoin normal" which might be executed. I'm not sure on this one, you can also set allow_match to 1 and execute "match" command while on server to see if it changes autojoin.