Hex tiles not snapping to grid

[katya.♥♥♥♥♥♥]

I set up a hex shaped grid on my table, and made each hex slightly bigger than my hex shaped tiles (I have 35 total). I moved them into 10 columns of 3 and 4 all next to each other. At first they lined up fine (I set the grid snap to center), but when I tried to move or flip any of them, they stopped snapping to the center and began snapping to the line. No matter how much I tried to reposition them over the center of the an individual hex on the gird, they would no longer snap to the center.

I created a semi work around by putting my own snap point in the center of some of the hexs, but this is not ideal as its hard/ finicky to find the exact center (if I don't, the tile ends up resting on the each of one next to it).

Any ideas why they are no longer snapping to the center of the hex grid? Thanks