In User Macro (template), the IF statement always returns true.

Steps to Replicate

1. Create a simple Rendered User Macro with the following sample template:

   ## @param PM:type=boolean
   #if($paramPM)
   PM is <b>true</b>
   #else
   PM is <b>false</b>
   #end
   

2. Insert the user macro in a page
3. In the Macro Editor, the default state of the checkbox is unticked
4. Save the page
5. The page shows 'PM is true' instead of 'PM is false'

Workaround
Define the default value of parameter in the IF statement:

## @param PM:type=boolean
#if($paramPM == "true")
PM is <b>true</b>
#else
PM is <b>false</b>
#end