This depends on your view of weight. For some people, weight means “we are talking about excess body fat”. For others, weight means “we are talking muscle mass”. In reality, it’s both.

So it could very well be that someone eating more protein and water is building muscle mass faster than they are losing fat. Fat can take a while to burn down in a healthy manner. Also having more fat means you will also retain more water, of which you are drinking more now to begin with.

Of course you will weigh more. But if you keep at it you will eventually weigh less, presuming you didn’t gain muscle like a hulk.