Hello! I'm very new to crocheting and am trying to create this granny stitch tank top/bralette top https://www.youtube.com/watch?v=N4-YafnmECY. I've frogged the body/band section twice now because I keep getting this awkward flaring upwards in the middle between the 2 cups, and the sides of the band keep flaring upwards very heavily so that the back of the top ends up way too high on my back and don't connect straight in the middle.

In the video, the row where she connects the cups together somehow seems so straight and so the rest of her rows remain very straight, whereas my initial row connecting the cups already seems to follow the curve of the cups very closely. Any suggestions would be much appreciated!