Tab '\t' has inconsistent spacing

Question

I am using \t to space out my output, but it produces inconsistent spaces.

For example, the following code produces

#include <iostream>

int main()
{
    std::cout << "Terms\tResults\tet(%)\tea(%)\n";
    return 0;
}

Terms Results et(%) ea(%)

Note the difference in space

Why is this so?

Answer 1

Tab ends each 8th column.

v       v       v       v       v
1234567812345678123456781234567812345678
Terms   Results et(%)   ea(%)