I believe the cups are too close together and/or too narrow. I also think the band is too big (see
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Fit Check] both 38DDD and 40DD cups are too big, but the 40 band is more comfortable : r/ABraThatFits
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bottom fits, now top is too big. : r/MAKEaBraThatFits
bra cups too close, band too big, cups too big, i think? 28C - The Little Bra Company » Erin
Is it normal for your bra cups to be too small but your band is too big? Like my size right now is a 36A, but the cups are too small but