is there a problem with this pool at the moment? I can't access the site.
The site seems to be working again now. It was down for me too.
As to the original question of how the pool had 110% of the network's hash rate, the answer is likely very simple. arg.epools.org is by far the largest ARG pool and often it's running at 80%+ of the network's hash rate. The pool hash rate displayed is calculated by the pool itself based on the rate at which shares are being submitted to it. The global hash rate it displays is retrieved from the Argentum client itself. Due to the way that the network hash rate is calculated by the Argentum client (and this holds true for pretty much any coin based upon Bitcoin), it can at times be wildly inaccurate as it's calculated by measuring the rate at which blocks are found. Due to the element of randomness in block generation, it's possible for the network to at times generate blocks much faster or slower than would be expected for its actual hash rate. This introduces a (sometimes quite large) margin of error into the estimates of the network's hash rate. As the network grows larger, this margin of error shrinks. In the same manner, the pool's hash rate calculations can also become skewed by streaks of good or bad luck. Thus, we end up sometimes with a situation where a large pool may appear to have more than 100% of the network's hash rate. It's really just an estimation error, that's all.
I've been mining ARG and DGC at the *.epools.org pools for the past few weeks and found them to be great. They're definitely not a scam.
