i have donated countless times and it dosen't progress or track as it should do

It started with me donating a small amount of food and it tracked, then i donated 75 food and it didn't stack up with the food i donated before. So i have donated over 200 food for the challenge, at first i thought you had to donate 200 at the same time so i saved up to 200 and donated all but it didn't work, so i think i have donated over 300-500 food and still not completed the challenge.