Hello and Welcome,
Just to add extra that there is an issue where old photos have “hidden votes” from the days when Ingress also counted so even if you get more votes than shown you may need to get more 
If you are in touch with people on your friends list send the locations as gifts and ask them to vote on the postcard.
This is the most common reason…
If you want to post more details we can check in to it for you. Title and Location (Long / Lat) is easiest.
Good Luck.