So... you opened your phone? The S7 line is enclosed (hence the IP68 Rating) and the water damage sticker isn't user-visible or serviceable. If you have 'checked' it, and that means you opened your phone, the seal is compromised and the waterproofing is no longer valid.
But still, try turning it off, leave it in rice for a day, and try it out. I'd also run the test on the screen (or is it on Developer Mode?) that shows where the screen is 'seeing' touch input to see if you have any 'ghost' input on it.