Yes I noticed the problems there but knowing how old is cryptomixer.io, I'm not worry about it.
All mixers can have a technical problem from time to time, but the most important thing is how they handle people question.

People joining the forum only to post their problem, you can see this in any topic.
Since they haven't got a reply to their email, they try their luck here.

However the user TraderBitPa is the kind of account that will edit his post later and include a phishing link, or a blog (full of phishing links)