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That field must appear more than once on your form. When that's the case, QuickBase must choose which value to enter in the field. To break the tie, QuickBase always takes the value from the last instance of the field, which in your case is the one you're leaving blank.
If the duplicate field is a mistake, just delete the double from your form. The field will then save values as you expect.
If you intentionally put the same field on the form more than once and you need to do so, change your method slightly to avoid trouble. Try one of the following workarounds:
Change the second instance of the field to read-only (on the form itself, not in the field's properties). To do so: Display the form (select Add a new record for example). Click the Customize button on the upper right of the form and then select Edit the layout of this form. A list of all the fields on the form appears. Scroll down to the duplicate instance of the field and click the small blue arrow its left. When you do so, some choices appear on the right side of the page. Turn on the read-only checkbox and click Save.
Create a formula-text field which displays the value from the desired field. This field's formula should contain only a field reference to the field you want to appear twice. So, for example if you wanted to show the Company Name field, the formula would read simply:
Insert the formula field on your form where you want to display the second instance of the field. Next time you complete that form, the formula field will automatically display whatever value you entered in the Company Name field.
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Adding fields: https://www.quickbase.com/help/adding_a_field.html