SCLogin into EngageBox popup - RTL Bootstrap conflict

Hi guys,
I'm loading SCLogin module in a popup man thanks to EngageBox : 
You can see it in action clicking on the hearth at the top right page corner  here  (Joomla 4).

As you can see the SCLogin is loaded in RTL mode.
Many Thanks to Tassos Marinos (EngageBox leader) we investigated it and it seems be caused "by the SCLogin modle HTML code in combination with the Bootstrap files loaded":
-  bootstrap.min.css  = It is from Helix Ultimate 2.0.12 template framework
-  sc_bootstrap5.css  = It is from JFBConnect 9.0.215

But, 
- JFBConnect Configuration > Advanced > Load jQuery/Bootstrap: No - (Enable to include the jQuery and Bootstrap Javascript libraries on your site. Disable if another extension or your template is already including this.)
- JFBConnect Configuration > Advanced > Load Bootstrap CSS: None - (JFBConnect requires the Bootstrap v2 or v5 CSS library included on the frontend page. Disable this setting if another extension or your template is already including this CSS on your site for a small page load time improvement.).
- SCLogin module > Advanced > Load jQuery/Bootstrap: No 

So, the  sc_bootstrap5.css  should never be loaded. Do you agree ?

I remain available

Hi Mel,
I changed it into the .../plugins/system/jfbcsystem/jfbcsystem.php file, but I still have the bug...

Maybe there is something else to change?
Maybe even directly in the SCLogin module ?