It may be lag, or CPANTS YAML module is too old

$ wget http://cpansearch.perl.org/src/SILASMONK/Test-Regression-0.03/M
+ETA.yml

$ perl -MDDS  -mYAML -le'Dump( YAML::LoadFile( shift))' META.yml
$HASH1 = {
           abstract   => 'Test library that can be run in two modes: o
+nce to generate outputs and secondly to compare against them',
           author     => [ 'Nicholas Bamber <nicholas@periapt.co.uk>' 
+],
           build_requires
                      => { "ExtUtils::MakeMaker" => 0 },
           configure_requires
                      => { "ExtUtils::MakeMaker" => 0 },
           distribution_type
                      => 'module',
           generated_by
                      => 'ExtUtils::MakeMaker version 6.54',
           license    => 'perl',
           "meta-spec"
                      => {
                           url     => 'http://module-build.sourceforge
+.net/META-spec-v1.4.html',
                           version => 1.4
                         },
           name       => 'Test-Regression',
           no_index   => { directory => [
                           't',
                           'inc'
                         ] },
           requires   => {
                           "Algorithm::Diff"   => 0,
                           "Test::Differences" => 0,
                           "Test::More"        => 0,
                           "Text::Diff"        => 0
                         },
           version    => 0.03
         };

$ pmvers YAML
0.70
[download]