It most likely means you have salty sweat, which is really common -
https://www.self.com/story/salty-sweat-exercise
https://www.healthline.com/health/why-is-sweat-salty
Talk to your doctor to be sure everything is okay, especially if this is new and you haven't started a new exercise program that would cause you to sweat more, or moved to a warmer climate, etc., but it's most likely nothing to worry about.