AssetMark Quantitative Analyst interview questions

I applied after seeing an announcement on the internet. In the application process I answered their preliminary questions positively, so I got sent an straightforward programming exam. I checked that the program worked and set them the source code. But the next day I received a simple not saying that they would not be moving forward with my candidacy. I am sure I did this exam correctly, so its disturbing that I received this negative response without any further explanation. Shame on them.