weird listbox - how to resolve it?

[astroboy]

Instead of number by reference of the list box, I keep getting an array of numbers.
See the pic.

See the attached
How do I resolve it?
Thanks in advance,
Clement

[parthabe]

You might ve chosen one of the following options, viz,

1] Array datatype from the Selection Mode -->> Datatype

2] 0 or more items

3] 1 or more items

Else, it remains a number only, instead of arrays.