Header Template CSS not applied on frontend

Hi Muffin team,

I'm building a website using Betheme and I have a critical issue: 

my Header Template's CSS is not applied on the frontend at all,

even though everything is correctly configured and the CSS file IS 

properly generated.

WHAT I DID :

1. Created a custom Header template in Mfn Templates

2. Set "Display Conditions" to "Entire Site" 

3. Built the template content in BeBuilder (top bar with phone/email,

  logo, main menu, "Quote" button)

4. Saved the template (confirmation message shown each time)

WHAT I OBSERVE :

- In BeBuilder admin view: the template renders correctly

- On the frontend: the HTML structure of the header IS rendered

 (template detected, classes mfn-header-tmpl-builder are present 

 in the DOM)

- BUT the styling is completely broken: 

  - logo is not constrained to its set width (displays at full 

  native image size)

  - custom colors I set are not applied

  - menu styling is default, not what I configured

  - button colors are default, not what I configured

DEFINITIVE TEST CONFIRMING THE BUG :

I went into the Header template via BeBuilder, selected the Logo 

element, and set its width to 50px (extreme value, just to test). 

I saved the template (got the "Saved" confirmation message), then 

refreshed the frontend in a private window with cache cleared.

Result: the logo did NOT shrink to 50px. It kept its original huge 

native size, completely ignoring my 50px setting.

This proves that NO CSS modification I make in the BeBuilder of the 

template is reflected on the frontend.

DIAGNOSTICS ALREADY PERFORMED :

✓ LiteSpeed Cache fully purged (Toolbox > Empty entire cache)

✓ Hostinger CDN/server cache fully purged

✓ Browser cache cleared, tested in private/incognito mode

✓ Tested with both Betheme parent theme AND Betheme Child theme

✓ Disabled all non-essential plugins, retested — same result

✓ Theme Options → Performance → CSS minification disabled

✓ Tried "Reset CSS files" / regenerate CSS from Betheme tools

✓ No custom CSS in Theme Options or in WordPress Customizer

✓ Tried creating a SECOND Mfn header template — same broken behavior

This is blocking a client project deadline, so any quick guidance 

would be greatly appreciated.

Thank you very much!