Hi
Siacoin is very slow coin(10min block time) and our pool is small currently.

Here's block finding statistics from blocks page.
https://siacoin.miningpoolhub.com/index.php?page=statistics&action=blocks

Currently pool found 6 blocks total. Pool finds block quite rarely, about one block a day.
This is why you didn't get reward at that time.

Don't worry, you get appropriate reward like other pools.
I hope more hash to come. Then it will be solved smoothly.

Thanks.