[Vuejs]-Vue 3: Field is not updating value

In the following line, you’re incorrectly overwriting the ref with a literal:

tradeSizeFactor = data.data.settings.tradeSizeFactor;
^^^^^^^^^^^^^^^

tradeSizeFactor is a ref, so the value must be changed via its value property:

tradeSizeFactor.value = data.data.settings.tradeSizeFactor;
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