Error on adding traffic signs

Hello, everytime I try to add a traffic sign, such as in this photo, I get an error saying “There was a problem adding your edits” when I click on “Publish Photo”. Am I doing something wrong?

http://imgur.com/7XL0POw

Also, it is very hard to click on the parking forbidden sign (“Proibido Estacionar”, letter E crossed one time), because when it zooms up, it slips from its position, from the right to the left side of the list.