It looks like only older growth? No problem if so.
Try moving it to a location where it has shade part of the day and maybe to a place where there is soil under the pot rather than stone / concrete. Reflective heat and water loss in a pot could be an issue if all of the growth is affected.
I never fertilized my papaya that much, every 60 days or so in our sandy soil seems about right, when I do fertilize I water thoroughly. Careful of regularly watering too much, they do not like wet feet, mulch liberally check soil moisture if you can at the pot drain hole before watering. If it's moist I wouldn't water.