Amniotic Fluid/AFI concern

Just wondering if anyone else has experience with their AFI measuring zero in 2/4 areas and the other two totaling 8.45. Is that still normal since it's over 2 even though two areas there is absolutely none? I'm just wondering how or why that happens...They all had fluid last week so I'm just wondering why at 34+3 I've dropped to none there. I drink water like my life depends on it too. I attached a photo of my results.