[HELP] Drop down elements overlap above everything

Hi People, I’m stuck with this issue where all the drop down elements are automatically above everything despite not having any z-index value.
For example, in my service page mobile view. I have a bottom nav menu with z-index 100, however all of my drop down neglect that and stayed above it.

This also happen when I start new project with a clean drop down element and a fixed element.

Help is appreciated with many Thanks!

Here is my site Read-Only:

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