If your spouse's W-2 income and withholding was commensurate with or right in line with your tax situation prior to entering, it may not a make a difference on the refund meter.

If it was over withheld or under withheld, you may have seen a difference.

The more information you enter, the more accurate the refund meter will be, and will not be totally accurate (and thus truly meaningful) until you have entered all of your information including all income and expense/deductions.

In other words, do not concern yourself with the refund meter until you have completed your return.