If it was a genuine mistake, I hope you get the ban lifted, but I want to ask you one thing. Why in the world would you open two tabs, read through two threads, and even post in two different threads at the same time? You can always read through the other thread you received a notification about, and then make a post there once you are done with the thread you are already in. What's the rush?

The mistake, even though it could be unintentional, happened because you are mismanaging things, and that's not how you do it. Using a forum in a mobile browser is nothing less than a headache, and on top of that, if you open multiple tabs with different threads, reading through all of them and trying to write posts in all of them simultaneously, you will surely mess up.

If you are given a chance and your account gets unbanned, try to avoid doing this. Keep only one tab open at a time, read through a thread, if you want, post a reply, and then move to another section or another thread within that same tab. It will make things easier and easily managable.