thank you first.
R3 and R1 are in Area 3;
R1 and S1 are in Area 0;
S1 and S2 are in Eigrp;
redistribute S3 Lo0 into A0.
When show ip ospf data on any of these three routers that run ospf, there is only type 5, no tpye 4.
sh ip ospf database external 126.96.36.199 you will see that route type is 2 (= O E2)
However, I see the following:
prefix 188.8.131.52 is originated by 10.0.0.2
>> 184.108.40.206 10.0.0.2 2 0x80000009 0x008098 0
a type 4 LSA for 10.0.0.2 exists in your
Summary ASB Link States (Area 3) = LSA tpye 4 for ASBR routers
>> 10.0.0.2 220.127.116.11 2010 0x8000000A 0x0037AB
this should be the LSA type 4 you are looking for.
18.104.22.168 should be the OSPF router-id of ABR between area 3 (the area where R3 is placed) and area 0.
about the fact that you see an O E2 route it is the default type see explanation in my previous post
From this show everything appears normal.
Hope to help
Could you paste the routers config please.