html code on mobile / sticky header

Hi!

Three things I can't figure out:

1. Using the calculator (html code) does not work correctly on mobile version. Can you indicate how I can adjust this code for mobile use? https://wvhl.nl/incassokosten-berekenen

2. The menu buttons in the sticky header all go to the same wrong page. In the normal menu the buttons link correctly. They have exactly the same module number.

3. The hamburger menu of the sticky header, mobile version, does not expand. This links to a page (the same as under point 2.).

Hopefully you can help me?

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