Yes, I know these examples are not free from errors ;)
My intention to create such a website was not to give complete solutions that can be used by copy/paste to your project. The examples are designed to give direction to those who learn leaflejs.
I know of a few bugs in this as well. I leave these bugs for people who take this code to fix the problems themselves, because I believe that this is learning about finding solutions.

So if you know how and you want to correct this error, you can put it here as a hint for others who have less experience than you ;)
I would like this page and examples to "live", unfortunately there is little response to#38 a pity.

Thanks for bringing up this topic.

Good luck in your studies.