The plugin has been deactivated.
How your phone crashes is a complete mystery to me, the <.p.>‘s are easier to explain. The <.p.> (and sometimes <.b.>) is an HTML thing. The reason why it is there is because the plugin (markdown) makes the preview in HTML. For me this works fine, because my account has full rights. The problem for other users is when they try to post your reply, the site will block the HTML because your account doesn’t have the rights to use it. HTML is not safe for in comment systems. There are additional plugins that will give limited HTML functions to the forum, but I have to investigate this first.
The forum itself doesn’t use let users edit in HTML, but does offer some of the functions, so there is no additional step where the site blocks it.