A little later that day, I dropped $190, I had $244 and I was trying to pay for dinner at the restaurant for about $230. But two attempts were unsuccessful.
Have you contacted CoinDebit support after this rejection happened or maybe you wrote them email and ask them for explanation?
One more thing I wanted to ask you, if you are traveling outside US in near future, try bringing CoinDebit card with you and test if it's working in other countries (officially it shouldn't work).
The card balance can be topped up higher than $250 - I just did it. Apparently you can spend up to $250 within 24 hours.
If I was in your place I won't go crazy topping up lot of money on that card, they started this company and card jus recently, and I know they are still testing it.
It's not impossible to think that card can be block at any time for whatever reason, so you should know the risks.