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If it's not the result of a Crosstab or other Transform tool, as @JosephSerpis suggested, the only other thing that could affect this is the Disable Auto Configure in user settings.
It might be worth checking, even you say your settings haven't changed.
If this doesn't solve the issue, try reproducing in a new workflow. Either start from scratch with a new workflow, or copy your existing one and remove tools until the issue goes away. If you do find a specific tool that's causing this behaviour, please post it here so we can all learn from your detective work