I need help with html exactly javascript, I have a bug somewhere in my script and I don't know how to fix it

Closed job
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Employer
Job category:
Other IT services
Expected budget:

100.00 PLN

Preferable skills:
html javascript
Published:
Valid until:

Job description

I have a checkbox list and let me list all selected ones

As I uncheck it, the items are deleted

(All text is generated in the barcode) more information after deciding

Required functions:

Place or location:

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