You probably installed the module in a non-standard location (e.g. using env var PERL_MB_OPT or PERL_MM_OPT), but didn't tell Perl to look there (e.g. via env var PERL5LIB).

What's the output of 

set | grep ^PERL

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In reply to Re: cpanm says OK but module not really installed by ikegami
in thread cpanm says OK but module not really installed by Anonymous Monk

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