Problem with a looped smoothed color change in a material

Development Rendering
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1

Hello, first time color changes from this (on pickture) shade of blue to this shade of yellow without any problems, but when color comes back to shade of blue, color continues to change until become pure blue. Starter content have material with same effect (M_Tech_Hex_Tile_Pulse), but when I change colors, I get same problem. What’s wrong?

289936-problem.png
289936-problem.png1122×569 244 KB

Sorry for my english.

2

I changed colors to pure blue and yellow, then added contrast node after lerp, but problem still here …

3

Oh, “Sine” have range from -1 to 1, that’s where mistake is.