Checking that provably fair system is works might not take a long time, but other than that we did many things. One of the example is the leak of site seed, this not only involve technical checking and ensure our server has not been compromised, but also questioning all team member involved in the project. We cannot assume this is the case (and lets not), but it is better to be safe than sorry.
As you might noticed, few hours ago the site profit goes down ~50 BTC again, this happened after some manual withdrawal. We know that the previous bet event is mathematically unrelated to the future event, so thinking that site will win after losing is fallacy, however, this is quite much for a coincidence. We are really sorry for the inconvenience, but for a moment we will have to ensure everything is legit. The roll function of P-4747 and 1DiCe1 also has been disabled.
First, as doog suggested, you should limit the number of people having access to the seeds, rather than sharing the seeds with your whole team.
Second, even if you seed is leaked, I don't think it is right to assume 1Dice1's win must be related to it.
Third, if you suspect the seeds have been leaked, you should change them now, rather than just disabling roll function of two big players.