Did I ruin the model? My crooked KAMAZ. Why did this happen?

Why I got such a crooked KAMAZ. I am building a KAMAZ model from the Zvezda company. And I tell the story of my acquaintance with this KAMAZ truck. Why did I ruin the KAMAZ truck model from the Zvezda company?
I criticize the model from the company Zvezda.
You can buy a model from the Zvezda company in the Model Shop store:
model-lavka.ru
Promo code for a discount of 200 rubles for the first order: MEHEWY0V
Promo code for a 10% discount - Dasha
My VK group: dashka_models_group
Dasha Tech Channel: • Зачем нужен танк Т-62?
My Yandex Zen: www.zen.yandex.ru/id/5eeb15d7...
My Telegram channel: t.me/s/dashka_models
My vk dashka_models
Ask a question or just thank: www.donationalerts.com/r/dash...
0:00 - Greeting
0:17 - Model overview
3:54 - Model assembly
4:29 - Model coloring
13:37 - Final result
My mail [e-mail]