Problems with Post

Whenever I use Movie Chat on my computer it allows me to post comments ,but when I'm on my phone every time I try to submit a comment it doesn't allow me to. Every time I type a comment or post on my phone it is automatically deleted ,and I have to started over again. When I try to submit it again the same thing happens it just deletes my whole comment right after i hit the submit button. Does anybody else have a problem with this whenever they use movie chat on their phones?