Site Collection URl missing when saving href in the Multiple line of text(Enhanced rich tex)field

Hello,

I hardcoded the URL and stored in the single line of text  variable as below,

then I used buid a string and stored the value in the multiple line of text variable as below,

then I used  set field value to store the buildstring variable in the list field(multiple line of text(enhanced rich text)).

My issue is : when storing in the list , "https://uatcdf" is missing in the URL but when i try to log the value it showing the full URL. 

SO what is the issue?

Thanks,

Sabarish