Why LVS Errors by SOC Encounter ?

 When I used the command "v2lvs" to transfer a netlist from SOC Encounter to a spice file, there were warnings :

"Warning: Duplicate port/net name "...." found in module "......" while doing case-insensitive lookup ."

I just ignored it , and did a LVS check . But the final result is :

Error:    Different numbers of nets.
Error:    Connectivity errors.
Warning:  Ambiguity points were found and resolved arbitrarily. 

...

INITIAL NUMBERS OF OBJECTS
--------------------------

                Layout    Source         Component Type
                ------    ------         --------------
 Ports:             10        12    *

 Nets:             140       131    *

...

NUMBERS OF OBJECTS AFTER TRANSFORMATION
---------------------------------------

                Layout    Source         Component Type
                ------    ------         --------------
 Ports:             10        10

 Nets:             140       129    *

...

It passed  a DRC check , but failed in a LVS check. I don't know if the failure reason is previous warnings . I have no idea why a netlist from SOCE couldn't pass a LVS check . After all the LVS check just check the design in different forms ,a netlist & a gds ,from the same SOCE design.

However my  same flow is OK for other designs.

Could anyone help me?

Thanks