It's normal behavior and it works the same on Linux, see Tk::Menu -> TEAR-OFF ENTRIES.

It's used for detaching the popup window, you can control it with the tearoff option:

my $menu = $menubar->cascade(-label => $text1, -tearoff => 0);

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In reply to Re: perl TK strange case by stefbv
in thread perl TK strange case by Anonymous Monk

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