Google Maps - can not store long/lat to data

Hi, this one is a real beginner question. I connected API and I have map on my page. I linked map’s current center address to a input’s placeholder filed.
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I added workflow to a button that should save current map location, shown in two input fileds (latttitude / longitude) to a prepared data structure

I can see lat/long number in those input fileds but save function doesn’t work as expected - empty fileds.

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what I do wrong? (I have google billing activated)