Help?

So for the context, last year i was mostly the whole year on a deficit, my metabolism adapted and it took a long time before i realised to upper my calories. Start of 26 i made it to 2000-2100 calories and had been eating like that for a while.

Now ive started a new cut, and been a week on it and my weigh wont go anywhere. It has dropped 300g, but usually my weigh drops faster than that in the beginning, because of the water.

I eat around 1500-1600, somedays 1800, and my maintenance is around 2100-2200.

I know i calculate my macros right, because ive been calculating for over a year now

Why is this??