2 Spine with 4 leafs (2 sets) L3 with same vlan on both sets

I'm testing a OS10 spine leaf configuration as shown in document (example 1) Click here 

I'm using 2 Z9100 switches as the spine and 2 sets of S4148 switches as leafs. Each set is connected via vlt. 

Now i've configured a vlan on 1 of the S4148 leaf set. This works perfectly, but I need the same vlan on the other leaf set also. So, I configured the same vlan on the other set. But I can't connect to devices from the second set. Can't ping to devices on set 2 from devices connected to set 1. Even the Z9100 switches can't ping the ip address set to the vlan on de second set S4148.

In the routing table of the Z9100 there's only the route to the first set and not the second. Is this 'by design' or do I need some sort of static route on the Z9100 switches?