As Bob said, it is likely the oldest bloom and just finished now. Also as mentioned, if you get water in the centre where the leaves meet (the crown) you could cause crown rot. It's not too easy to properly dry that out and it shouldn't get wet.
You may want to check the roots and possibly remove some of the moss fairly soon. Many Phals come packed in moss and in the very centre is a tight ball of moss that remains very wet even after the rest dries. This is a recipe for root rot and death of the Phal. I usually slide the plant from the pot and pull away the moss till I can see what's going on at the centre. 100% of my Phals have had this wet tight ball of moss that must be removed. then you can replace the other moss in amongst the roots leaving some loose airy spaces. The roots need to breathe and in the wild would be attached to a tree where they get lots of air and breezes. Many people re-pot their plants after the blooms are done and use bark or a mix of moss and bark. You can do this, but at the very least, fairly soon you should check out the root and moss situation. Phals bloom for quite long and often if you wait that long, the roots are already rotting. Also it should never sit in water, so make sure the outer pot is not collecting water. Let it almost dry out before each watering. Enjoy your orchid it looks lovely!
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