The lines bend to the water, so it's not the screen.
It's a graphical setting you have set or it's how the GPU you have renders the water. I would look into the Water enchantment mod that has custom textures for it. That may help.
Have you looked if it is the same on another game, if it is, it probably is your screen, otherwise it could be if you have/dont have a texturepack, if you have one, deactivate it, if you dont have one, well, install one :p
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It's a graphical setting you have set or it's how the GPU you have renders the water. I would look into the Water enchantment mod that has custom textures for it. That may help.