Liberkey Firefox won't run from menu or shortcut!

When I click Launch from Liberkey menu or select the shortcut, my previously installed Firefox in C:\Program Files\Mozilla Firefox runs instead. The Liberkey Firefox is selected as default browser.

What's really strange is, I renamed the C: Firefox.exe and it still runs! What is wrong? Thank you.

Liberkey Firefox is located here: Liberkey\Apps\Firefox\FirefoxLKL.exe and nowhere else.
Do not set Liberkey Firefox as default in Firefox options panel, do it using Liberkey File Association tool (KeyfileAssoc) indeed in order to keep the association portable.