Ok, this is not weird at all
When you close your order, you get some profit or loss.
This P/L can be in different currency than your account currency. Money from your account will be withdrawn or added at 21GMT at Settlement ("end of day" procedure).
For example, if you have profit JPY 2000 at 12:00 GMT, it is USD 20. But, it can be USD 25 at 21:00 GMT. To show you actual equity, we recalculate P/L to USD (or to your account currency) during the day.