I'm not sure how I can address this visual bug (that's if it is in the first place) but basically, the water reflections in your Enhanced Default shader pack detects almost everything that's displayed on my screen, like my viewmodel or even faraway mobs. Could you explain why this is happening?
P.S. I love your Enhanced Default shader pack to death. It's well-optimised and performs beautifully with modpacks. Keep up the good work!