Hyundai Tiburon Radiator Cap

I’ve Noticed My Car Cannot Hold Much Antifreeze For A While Now. Every Time I Refill It, It Can Only Hold Like 1/4-1/2 Of What It Should...

Car Gets Hot And If I Touch Cap At All Steam And Fluid Will Come Out, Is This Normal. Cap Is New And Has A 0.9 On The Top Engine Is A 2.0