The last column is not the tax status of the infusion. The last column on Cash Infusions is "where does the money go one received". To make a tax free infusion you just set the Tax Rate to apply when it comes in to 0%.
The last column is “which bucket do you add this money to” and only Taxable infusions show up on the graph. It does not go into Tax Free but probably a Taxable checking account. Since the graph is an after tax graph it does not show the Tax Free on the retirement graph because that is more for rollovers. Set that line to Taxable in the last column and you should be good.