Firstly I would not recommend weighing yourself every day. This is unnecessary and not accurate, as you have daily fluid fluctuations so the scales are not really portraying the whole truth. If you must use the scales then minimum once a week.
In simple terms, if you are not putting any weight on whatsoever then you probably need to eat a bit more. As you say, perhaps your metabolism has been kick started. 2700 daily cals is not a huge amount for an active male who is training also.