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I've had swords do this for two different reasons.

1st.) Most commercially produced swords are grown in emersed set-ups. They grow faster and are algae free. When first submerged they will cast off the older foliage. Swords then grow new leaves which are slightly thinner and better suited to a full aquatic environment. Very normal behavior. As you also say this plant is newly purchase, a very real possibility.

2nd.) I've had my sword's leaves blister from too much Excel. (Or too long of a bleach dip.) Yet most swords have a healthy enough root stock that they do recover with all new foliage.
 
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