Since I switched to Nougat OS in my S7 Edge, I'm getting this display bug, it happened in Stock ROM and now that I'm using a Close-to-Stock Custom ROM(I thinked it could be the ROM) it appears again, I don't know if is the Nougat OS itself or the provided OS by Samsung.
-Samsung S7 Edge (SM-G935F)
-Android 7.0 Nougat
-Swiftkey Version 184.108.40.206
-Steps to reproduce: Its kinda random
And sorry by the way about my bad English.