In the for-sale listing, I checked "firm" on the price and posted the ad.
After posting the ad I found that unchecking "firm" would not save.
If I checked the "trade" option, unchecking the "firm" would save. However, unchecking the "trade" option would not save. It would seem I have to check something in order to save the option to uncheck something.
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Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:49.0) Gecko/20100101 Firefox/49.0 (this will help us make sense of your bug report)