Card view and firebase problem

Hi, I’m try to make apps that showing a few of card view with firebase, and i’am using cardview1 extension. but I confuse because when i test it, it always showing message leght =1 index=1. In my opinion its maybe because the card view always calling every firebase call value, so that make it happen, but i’m not sure its just my opinion. Maybe someone can help me to solve that ???
This is my block

Can you share the picture like this because the 2nd picture is not clear?

share aia of your picture

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