“Use of a signed integer operand with a binary bitwise operator” – when using unsigned short

The code for this warning checks if either operand to the bitwise operator is signed. It is not sequence causing the warning, but 14, and you can alleviate the problem by making 14 unsigned by appending a u to the end.

(sequence >> 14u)

This warning is bad. As Roland’s answer describes, CLion is fixing this.