Frontend doesn’t respect ordered list style

This is because your commercial theme sets this style individually for all list items. However, you have only set it manually for the surrounding list. That is not enough.

I see 4 possibilities for you:
a) You write the style for each individual list item in the source code. This could be very time-consuming and error-prone.
b) You write the desired style in a separate style file, e.g. like this:

body .entry-content ol > li {
list-style-type: list-style-type:upper-roman;
}

c) You use the plugin I developed https://wordpress.org/plugins/nested-ordered-lists-for-block-editor/ which allows you to format list items in the list block with Roman numbers.
d) You ask the support of your commercial theme for support: https://bizbudding.com/templates/mai-prosper/