I have 3 upcoming Delta flights. I paid for an upgrade to Comfort+ for 1 of them, however all 3 flights are now showing seats in Comfort+ (previously they were unassigned main class) with designated "W" ticket class. Is this an error or did I just get 3 Comfort+ upgrades for the price of 1?

I'd call Delta and ask, but don't want to risk them correcting the mistake