Thank you for providing the photos. I also apologize for the late reply.
After getting the gas, Ana suddenly appears and tells me to deliver the gas I got to the guy. I don't remember exactly what happened after that, but I think "Objective" was changed from the one in the picture. But I can't get the gasoline, and the "Objective" is still the same as in the picture. If so, it must be a bug.
However, most bugs in this game can be fixed by restarting the game, so as I mentioned in my previous answer, I would recommend saving the game, quitting, and restarting.