you can try adjusting the boundary settings for a tighter fit - but I've noticed in cura the visual representation of the supports doesn't match the physical outcome - gravity exists out here, and the little gap ensures that it doesn't bind too tightly to the connecting surface and cause damage when removed.
you can always try a test print of just the upper section, just cut the model below the questionable support, and print only there up.
watch it closely, if it looks good after 10 or 20 layers, kill iit and print the whole thing.
this saves you time and effort and allows you to validate individual structures without waiting for the whole model to print.