Why does this numeric compare fail in MDX?

Question

Given the MDX query below you can see that under certain circumstances MDX fails to see the .22 is not less than .22; what's going on here?
WITH
MEMBER Measures.X1
as
 1.0 + ((22.0 - 100.0)/100.0),
FORMAT_STRING = '.00'
MEMBER Measures.Y1
as
 IIF(Measures.X1 < .22,
'Fail', 'Pass')
MEMBER Measures.X2
as
 (22.0/100.0),
FORMAT_STRING = '.00'
MEMBER Measures.Y2
as
 IIF(Measures.X2 < .22,
'Fail', 'Pass')
MEMBER Measures.X3
as
  StrToValue(1.0 + ((22.0 - 100.0)/100.0)),
FORMAT_STRING = '.00'
MEMBER Measures.Y3
as
 IIF(Measures.X3 < .22,
'Fail', 'Pass')
MEMBER Measures.Z
as
 IIF(.22 < .22,
'Fail', 'Pass')
SELECT{[Measures].[X1],
[Measures].[Y1],
[Measures].[X2],
[Measures].[Y2],
[Measures].[X3],
[Measures].[Y3],
[Measures].[Z]} ON 0
  FROM [APM]
Thanks,
David Skelton

Answer 1

I'm sure you are correct... thanks for the quick response...
Given what you've said I think this results for Y1 in this query are misrepresented:
WITH
MEMBER Measures.Y1 as
 1 + ((22 - 100)/100), FORMAT_STRING = '.0000000000000000000000000000'
MEMBER Measures.Z2 as
  Y1 - .22, FORMAT_STRING = '.0000000000000000000000000000'
SELECT{[Measures].[Y1],
       [Measures].[Z2]} ON 0
  FROM [APM]