meihuak In your database, under settings, look for extensions_enabled and paste the contents here.
It will look something like this:
["flarum-approval","flarum-emoji","flarum-flags","flarum-likes","flarum-tags","flarum-lock","flarum-markdown","flarum-mentions","flarum-sticky","flarum-subscriptions","flarum-suspend","flarum-statistics","reflar-traditional-rank-icons","reflar-koseki","flarum-lang-english","reflar-webhooks","flagrow-upload","flarum-bbcode","reflar-twofactor","reflar-stopforumspam","reflar-level-ranks","fof-spamblock"]
