I can understand with all of the scandal lately that people are more skeptical now than usual. Thank you LtPaxIV, flippy and Spoink for the vote of confidence.
Their provably fair code checks out for me, so if you've verified your rolls and it's all good, then you were simply unlucky. Rigging a system like this is theoretically possible, but would require a great, unrealistic expense in time and today's hardware, especially if you've set your own client seed.
Verified provably fair then!

However, I do recommend that Edendice offers the option to choose to bet low/high. Without such an option, there will always be concern from some that the server seeds have been rigged to favour low numbers.
Thank you for pointing this out. I do agree with you. I know people enjoy having the option to change high or low and will make players feel more comfortable. This and many more features will start to appear soon!