That's a feature of forex trading.
You earn interest on the currency you are long, and you pay it on the currency you are short. If the former has a higher interest rate than the latter, you make money. If it's lower, you lose it.
Most brokers/dealers will only charge roll-over or carry interest on positions held "overnight" (beyond the NY close). That means day traders can generally avoid the whole issue. (Oanda calculates and pays/charges continuous interest, but they are the only one I'm currently aware of).
If you are a longer-term trader, then certainly you need to take the carry into account. If the interest rate spread is small, though, then it won't matter too much.
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