I found a bug! If you pick the third option under the homosexual affairs card, the one about trans people, you can then pick it again the next time you draw the card. I took a look inside Github to see what might have caused this, and I think that it's the fact that that particular option is locked with the “sex_change” flag, while selecting the option increments the “trans_rights” flag. I suppose that this might have been intentional to ensure that there's always an option to pick on that card, but if not you may wish to take a look at it.