Impega 3laykum salaam! I can see this is related to https://github.com/islamic-network/api.alquran.cloud/issues/90, so I will close that issue and respond here.
First, we don't run the Global Qur'an API - for that you will have to specifically reach out to the Global Qur'an team.
Second, you are comparing a tajweed edition to the standard Uthmanic text - it's not a like for like comparison. For that, use a different edition. You can use https://alquran.cloud/arabic-font-edition-tester?reference=1%3A6 to work things out.
The tajweed edition adds characters to make recitation easier but requires understanding of tajweed specific characters. So that Hamza with a madda (as far as I am aware) means that alif needs to be elongated during recitation. I am by no means an expert, but see https://alquran.cloud/tajweed-guide as a reference.
InshaAllah I hope this helps.
And God knows best.