Hi Ngkin,
The Host TEP network and Edge TEP network must be on a different VLAN / subnet and route to each other or else the traffic will just drop and the tunnel will never form, if the edges are sitting on a esxi host prepared for nsx-t (nsx-t vibs installed on it).
From what I can see your host TEPs and Edge TEPs are on the same network, although cannot exactly see if the edge vm's are sitting on a host prepped for NSX-T.
If this is the case then this should resolve your issue.