Paving stones on the sidewalk suddenly uneven

Hello, we also had such elevations in a small section of the pavement... I removed some stones and took a look. And lo and behold.. there was a narrow root underneath that could not continue further at the curb, so the root found new paths there and formed thick knots. These now pushed up the paving stones. I then removed the root as best as I could and reset the stones with some fresh sand. Looks great again.. Best regards Steffi.

look underneath if it bothers you.
that would bother me too.
if it concerns you, find the solution.