ovulation tracker confused with FAM line

I am so confused the FAM line on my ovulation tracker says i ovulated 5 days after my positive ovulation test. I got a positive opk on day 18 going down day 19 and negative day cycle day 20 and i thought you ovulate within the next 24 hours of your postive. but the FAM line says i ovulated 5 days later, could i be wrong, by then my cervix was not as open it had dropped lower and was firm and i had creamy cm would would indicate that im past ovulation right? Im also confused because after i think i ovulated using my opks my temp did go back up but not past the cover line? here is the link to my ovulation tracker any insight would be great. thanks

http://www.medhelp.org/user_trackers/show/229366?personal_page_id=1336884