xenforo2 not register

Hello, Can not register for our users forum, we had no such problem before upgrading to XenForo 2. At the moment there are no problems in the ongoing forums with XenForo 1 on the same server. Our Server Properties; - cPanel v68.0.37 - MariaDB 10.0.34 - PhP 7.0.29 - LiteSpeed 5.2.7 Our...