I checked the normals, those look good.
As well I checked if there are overlapping faces or open edges,
I have no seams whatsoever. so it should be all the same smoothing group
I also deleted the faces and tried to make new ones didn`t work either. super strange. Maybe there is something I overlook?
EEVEE has always had issues with glass/transparent materials. There are work arounds but I typically steer clear of using glass/transparent objects in EEVEE and just stick to the tried and true Cycles. There are youtube videos of transparent setups for EEVEE out there though.