Yes, that's called "version retrograde". I detect one of those about every two weeks on the CPAN. I wanna write an autodetector some day, but haven't gotten enough brainpower for it.

The proper answer isn't "delete old versions", though. The proper answer is to do what it has said in the perlmod manpage for a long time:

$VERSION = do { my @r = (q$Revision: 2.21 $ =~ /\d+/g); sprintf "%d.".
+"%02d" x $#r, @r }; # must be all one line, for MakeMaker
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-- Randal L. Schwartz, Perl hacker