Why am I getting just one of 3 daily challenges at fortnite?

Get always only a challenge of actually 3, at first I had once 3, then I've done all 3 and since then there's only one daily and the other two is only done, but no new ones are added

Every day you get a challenge in Fortnite when you log in.

Overall, you can have three open daily challenges.

Will your 2nd challenge be dealt with if you could not do the 1st? It could only be a queue. So you can stay away from the game for 3 days without any worries and your challenges will still be waiting for you.

I do not know for sure, but that's the way it is in another game as well. (Heroes of the Storm)

There's only one daily challenge a day!