super six rear springs

Hi I have aquired a 1926 super six chassis which I am starting to restore.

during the course of dismantling the rear axle I have discover that the springs have different amount of leafs from one side to the other(17&16)

Is this usual? It looks fairly original & not modified,did they ever do this from the factory?also the the spring with the greater number of leafs is 20-30mm higher than the other?

Any ideas what I can do?
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