The max length of the "Element" field on Choice (sys_choice) table is 40.
Length of "Element" field name on sys_choice table
System automatically truncates the extra characters of the element value if it's length is >40.
If the Element name is : "u_elementNames_elementNames_elementNames_" , which is of length 41.
When you create the choices for this, they will be saved with the element "u_elementNames_elementNames_elementNames" , by truncating the extra 1 character.
So, the choices won't be available with the actual field : "u_elementNames_elementNames_elementNames_" on which we are expecting.
**Make sure to use Element names with <40 charters length on choice table.