Be careful when booking flexible "refundable" fares.

I was booking a ticket for a friend who is on a Mexican passport on AA.com for a flight to/from Mexico. After selecting a refundable ticket, it would say something like "This person is a Mexican national. Certain taxes are waived." And then it reduces the fare (removing some taxes that Mexicans are exempt from for Mexico travel). However, when it did that, it turned the refundable fare into nonrefundable.

I found out the problem happens when using the Apple Safari web browser, but it does not happen on Google Chrome.

To be 100% sure, put the fare on hold and call AA. Ask them if the fare is 100% refundable without any fees. They will check for you. However, for some reason, it will take them over 10 minutes to check. I am not sure why AA doesn't make it easy to check if a fare is 100% refundable or not.

I also don't get why AA.com doesn't make it clear if a fare is refundable or not. Why look though the complicated, confusing legalese of the fare rules?