Hi,
This is the standard functionality of the UI elements and it's binding concepts.
For eg, If you bind the same attribute(String = TEST) to all of your UI elements, then in the final output you will only get 'TEST' for all the UI elements.
Check for the below help doc on Data Binding.
https://help.sap.com/saphelp_nw04s/helpdata/en/af/434941db42f423e10000000a155106/content.htm
BR,
RAM.