I fall on my sword for this. It turns out to be a double call to the application from the HTML code. The HTML file has a textarea that gets data from a scanner via the keyboard buffer. This input is checked via a javascript function called by the onkeyup event. This function is being called twice and the zombie is the result of the second call overriding the first.

Thanks to Bilfurd for your reply. And I'm strict on use Strict.

And I'm strict on use Strict.

Strictly speaking, it's use strict :) — module names are generally case-sensitive (even on Windows).

> perl -e "use strict; $foo=1"
Global symbol "$foo" requires explicit package name at -e line 1.
Execution of -e aborted due to compilation errors.
>
> perl -e "use Strict; $foo=1"
>
[download]

Reason is that - if you use Strict - the use will implicitly attempt to call Strict->import, which isn't found, as the respective namespace is declared with package strict; in the module's source (this must 'fail' silently, as a module is not obliged to supply an import method).  Thus, any code in an existing import() isn't executed, which in turn renders some modules (and in particular pragmata) non-functional, or makes them behave differently...

Update: just in case...  for whoever downvoted without saying what's wrong (: this of course only applies to Windows, where the respective file is found at all, due to the filesystem being case-insensitive.  Geez...