enable checkbox duplicate values

Hi, I use a custom calculator plugin.
The structure is “number|name” – now I have the problem.
if I want to store the data in the database makes cf7 out of the three 25| only one.

Does anyone have an idea how I can disable the pooling of double value?

[checkbox_custom myfield “25|wert1” “25|wert2” “25|wert3” “28|wert4” “28|wert5” “28|wert6”]
[submit “Senden”]