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Garmin Forerunner 735XT not correctly measuring laps in pool.

I normally swim uninterrupted in the pool, and I rely on my watch to track distance. I’ve never really questioned it in the past, or counted laps to verify my Garmin was accurate.

The last several weeks I’ve been done specific sets with pauses at the wall, and I’m realizing my Garmin is not accurately tracking my laps. It is quite obvious now when I do 50 yards in a set and my Garmin records 25. 

Any ideas on how I can fix this? Is there a sensor to clean or software update that I’m unaware of? Thanks in advance!