Steps to reproduce:

1. Create a HTTP agent item.
2. Add 3 query fields: c: 3, b: 2, a: 1.
3. Change the order to a: 1, b: 2, c: 3.
4. Press Test to test the item, and then Get value.
5. Open browser developer tools, switch to the Network tab, find the HTTP request, inspect the form data.

Result:
Query fields are sent in the order in which they were added:

query_fields[name][1]: c
query_fields[name][2]: b
query_fields[name][3]: a
query_fields[value][1]: 3
query_fields[value][2]: 2
query_fields[value][3]: 1

Expected:

query_fields[name][1]: a
query_fields[name][2]: b
query_fields[name][3]: c
query_fields[value][1]: 1
query_fields[value][2]: 2
query_fields[value][3]: 3

The same applies to headers.