Not knowing what specie of wood the table's veneer is, though teak was a common furniture lumber during mid last century in Europe....
Cherry darkens with age. Your table's veneer may express a similar characteristic. Generally, a leaf of a table is used less than the ends, hence your leaf may not have as much exposure and may not have changed color, as the ends have. This may be a reason why the leaf and ends are different colors or shades of the same color. Teak does change color with age.
I don't have experience with teak. Bob may have some good suggestions.