BTC-Alpha's operator is working to resolve the issue. As long as your BBR is showing as a confirmed tx on the explorer then its on your Alpha wallet, it's just not showing up on their system. Stocks had a similar problem and they ended up crediting accounts for the correct amount of BBR.

As far as trading engine goes, Alpha's engine is much more advanced than stocks. Sometimes it takes 2 minutes to execute an order on Stocks whereas Alpha it's near instant. You can't really compare the two when it comes to execution speed, charts or order depth functionality and this is why I funded the listing fee there.

As a rule of thumb when sending any crypto to any service, try sending a small amount before sending a full amount to make sure it clears on the other end.