We're apparently pulling in some votes for incorrect bills from the journal.
example:http://openstates.org/co/bills/2015A/HB15-1328/
has 2 votes on the same day with different counts, but only one shows up in the journal:
http://www.leg.state.co.us/CLICS/CLICS2015A/csljournals.nsf/%28jouhse%29/3F654331138F4A6A87257E34005974A8/$FILE/Ap27.pdf