lvs报错，layout比soure多了几条nets

report在这里
Error:Different numbers of nets (see below).
Error:Connectivity errors.
LAYOUT CELL NAME:my_test
SOURCE CELL NAME:my_test
--------------------------------------------------------------------------------------------------------------
INITIAL NUMBERS OF OBJECTS
--------------------------
LayoutSourceComponent Type
--------------------------
Ports:2222
Nets:722717*
Instances:673657*MN (4 pins)
675663*MP (4 pins)
------------
Total Inst:13481320

NUMBERS OF OBJECTS AFTER TRANSFORMATION
---------------------------------------
LayoutSourceComponent Type
--------------------------
Ports:2222
Nets:373368*
Instances:1212MN (4 pins)
1212MP (4 pins)
1212SPUP_2_1 (4 pins)
187187_invv (4 pins)
22_invx2v (4 pins)
8888_nand2v (5 pins)
2222_nor2v (5 pins)
1212_sdw3v (5 pins)
9696_smn2v (4 pins)
9696_smp2v (4 pins)
------------
Total Inst:539539

* = Number of objects in layout different from number in source.

**************************************************************************************************************
INCORRECT OBJECTS
**************************************************************************************************************

LEGEND:
-------
ne= Naming Error (same layout name found in source
circuit, but object was matched otherwise).

**************************************************************************************************************
INCORRECT NETS
DISC#LAYOUT NAMESOURCE NAME
**************************************************************************************************************
1Net 133n30
155
--------------------------------------------------------------------------------------------------------------
2Net 66N29
131
--------------------------------------------------------------------------------------------------------------
3Net 83N33
146
--------------------------------------------------------------------------------------------------------------
4Net 75n31
125
--------------------------------------------------------------------------------------------------------------
5Net 74n32
59

**************************************************************************************************************
INFORMATION AND WARNINGS
**************************************************************************************************************

MatchedMatchedUnmatchedUnmatchedComponent
LayoutSourceLayoutSourceType
-----------------------------------------
Ports:222200
Nets:37336800
Instances:121200MN(N12)
121200MP(P12)
121200SPUP_2_1
18718700_invv
2200_invx2v
888800_nand2v
222200_nor2v
121200_sdw3v
969600_smn2v
969600_smp2v
--------------------------------
Total Inst:53953900
1.这是因为什么原因造成的呢?
2.我在设置global net connections的时候，connection list是空的。怎么回事呢?

两个办法：
1，DC出网表的时候就避免同时存在N和n
2。LVS验证的时候区分大小写。

果然有这个大小写的问题。谢谢！