Magnetic Loop Controller by TF3LJ

Has anyone also built this Magnetic Loop Controller by TF3LJ?
https://sites.google.com/site/lofturj/13-to-automatically-tune-a-magnetic-loop-antenna
I have some software bugs with the provided code and I'm curious whether someone tried to fix them.

greetings Laurin
HB9HJY

What bugs? Does the code compile or something else?

The code compiles well. But there's a strange behaviour. Sometimes the stepper rotates a few steps without giving a reason to step (encoder or up/down switch). This leads to a deviation from the stored frequencies.