This is likely due to switching providers or whatever is going on. I don't think its anything to worry about. What is really worrisome as I stated before is that developers of switching programs are just adding this pool in sending hundreds of people over to a pool that is far from stable currently.
I am quite new in this switching thing and during a week of testing I could tell this - if you as a pool owner/admin try to reach max stability - you do not add too much coins and algos. And vice versa. What is interesting and worrying - how the hell pools with 0% fee earn? On transactions and exchange fee? Why there is no information about it on site? Or using skimming? But it is not kind of unfair playing in business model.