Not sure what is going on here but I’ve been checking flights this morning for December 14th from LAS to BNA one way. The Southwest website and app only show these expensive fares and nothing in the basic bucket.

But when I search it through Google flights cheaper flights appear and routings appear that DO NOT show as options on Southwest’s site. Pasted examples below. When you click through to purchase the $175 flight from Google it takes you to the Southwest purchase page and the price sticks.

Not sure if this is common/temporary glitch while Southwest does fare maintenance on their site?