Leaflet getBounds() returning longitudes greater than 180

This is due to worldCopyJump being set to false by default. Setting it to true, and the markers will display correctly, as the world won't overlap.

I was seeing a similar thing, except I was processing a map click event via a callback as event.latlng.lng. Adding worldCopyJump: true did not fix this issue for me - I was still seeing longitude values greater than 180.

In the end, I called the wrap() method to the latlng object:

event.latlng.wrap().lng

which fixed the problem.