After digging into the problem i tried to see the root cause to see what factor affect this problem

i found it relate to the add_conditional_format() method and rules were being sorted into row/column order instead of insertion order only with nested ranges

I raised a GitHub issue that was fixed in version "0.79.1" The issue was present in version "0.79.0"

and here is the change log :

• Fixed issue where the precedence order of conditional formats wasn't being preserved and the rules were being sorted into row/column order instead of insertion order. This issue would only be visible with nested conditional formats and shouldn't affect most users.