And blur out your email address in case of trolls spamming you

I believe you get Gaara fragments on 1st, 2nd, 4th and 5th days.

From the screenshot it would appear you are on your 3rd day so you don't get fragments, it's not a bug it's intended.

Two more days of 50 fragments will give you the 100 you need to upgrade it to 4 star.

You can't skip if you want him at 4 star, the event said you gotta recharge 5 days to get him at 4 stars, recharge 2 more days and you will have him at 4 stars.