The first XXXXXX is what you paid in yourself (i.e. the government used to top this up by 25%)
The second one is the value before the 23% exit tax is applied. Since you kept the policy to the end of the SSIA scheme, this tax no longer applies.
The third one is the value after the 23% exit tax. Since you kept the policy to the end of the SSIA, it doesn't apply and that is why the second and third figures are the same. During the SSIA scheme (2002-2007), those values were different.
In effect your SSIA has lost the entire government contribution plus or minus that hundred quid you're talking about.
If you don't need to cash it in, hang on and the value will most likely rise in the medium term.