Volume Commission through ECN question

Had a question about Volume Commission with an ECN.

On my Demo I purchased 50 lots yesterday and Vol-Cos was $185.69
It rolled over today and Vol-Cos for today was $92.76
There was also a swap fee of $150 which I understand gets charged daily.

I'm still learning, but I thought Commission is only charged when you
place and order and when you sell it again, not everyday? Any thoughts?

The daily swap fee is a little confusing to me too still as I thought that the charge
would be the interest difference between the currency pairs, yet I was charged
50% more. Is that the way it is generally?

I don't know about your broker's commission policy (better ask their support team) but the swaps are usually charged in unfair manner - you get charged more when the interest rate difference is negative and you get paid less than the difference is positive.

Good to know thanks. Have to recalculate all my strategies then as I did not expect a 50% extra charge on the swaps. Knew there had to be more to it then I was initially thinking! Still don't get why I get charged commission everyday either, but I'll email them and see what they say.