Another reason might be that he disagrees with the Order's strategies. Harry has his own ideas about how to fight against the dark forces. If the Order's approach seems too passive or too risky to him, he could get angry as he might think they are not doing enough or are making things worse.
Maybe he feels that the Order is keeping secrets from him. In many fanfictions, Harry can be a character who values honesty and when he discovers that the Order, which he may consider an ally, is hiding things from him, it can make him angry.
It could be because the Order's actions put his friends in danger. For example, if their plans lead to his friends getting hurt or into difficult situations, Harry, being protective of his friends, would be angry at the Order for not being more careful or thinking things through.
Look to Chapter 90 for the clearest answer. It begins with Watching He Yun gradually take control of a tractor under professional..., keeps building through Director Sun," Qi Tianyu, having finished admiring, started to complain,..., and lands on Jiang Li finally let go of Jiang Yan's arm..
If you want the clearest chapter reference, go to Chapter 95. Early on, Hearing others praise her daughter, Aunt Lin was smiling so wide she...; later, the chapter leans on Lingling really is a good child..
The best chapter pointer here is Chapter 143, "How about Grandma introducing a girlfriend to you?". It opens with Is there really such delicious fish soup in the world? and closes on The live stream audience couldn't help but praise, "You can only see such....
Chapter 132 is the strongest chapter-level answer because it starts from The new girl in the live-streaming room went crazy. and follows through on He stir-fried the other dishes Jiang Li had prepared, and somehow managed....
If you want the clearest chapter reference, go to Chapter 121. Early on, Seeing that Wen Jiaojiao's condition had improved significantly, Director...; later, the chapter leans on A doctor, donned in a white coat, hurriedly got out and immediately asked....
A practical answer is Chapter 72, because it turns the idea into a concrete scene. The chapter opens with Jiang Yan was still griping when suddenly a fair hand reached out beside..., adds pressure through [HAHAHAHAHAHA, this is the first time I've seen Director Sun speechless.]..., and ends on.
Look to Chapter 95 for the clearest answer. It begins with Hearing others praise her daughter, Aunt Lin was smiling so wide she..., keeps building through Lingling really is a good child., and lands on Your boyfriend must have studied in another province, if I'm not mistaken,....
The best chapter pointer here is Chapter 96, "Can't Easily Forgive the Scumbag!". It opens with Jiang Li's words seemed absurd, yet there also seemed to be a trace of... and closes on Xu Ling couldn't contain her soft sobbing, "How could this happen?.
The best chapter pointer here is Chapter 128, "Which family created the white lotus persona to go transplant rice seedlings in the field?". It opens with Still hungover, Huo Ziyang had just awakened from a blurry dream when his...
Look to Chapter 95 for the clearest answer. It begins with Hearing others praise her daughter, Aunt Lin was smiling so wide she..., keeps building through Lingling really is a good child., and lands on Your boyfriend must have studied in another province, if I'm not mistaken,....