OK, after working with what I provided, I realized the usage of both sequence & auto_nextval caused a double increment. Therefore, remove teh auto_nextval => 1 from above:

__PACKAGE__->add_columns(
   "id",
   {
    data_type => "NUMBER",
    default_value => undef,
    is_nullable => 0,
    size => 126,
    sequence => "seq_application_id"
   }
);
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