Thought about it and I have a theory about what happened with the arena reset. This is all speculation, but it makes sense to me at least.

I'm guessing that they have a server cluster rather than a single server. They added a new server, but it was not updated to the rankings before reset it was probably updated at reset. So, it saw all the scores sitting at 1900 instead of the standings from the previous week. When we started playing, it dropped us according to what it thought should be our points. Some people got point jumps because there account got properly reset by the servers with the right data. Points aren't counting right because of the difference between what one server thinks vs what the other one thinks. Apparently, they have no way to just copy the highest point totals to all servers. Hopefully, when the arena resets again it will at least start us at the proper point based on what our score is showing now. It doesn't fix the problem of current standings or points, and since there has been very little communication regarding the issue other than have patience I wouldn't hold my breath on any other fixes for it.