Why using Decimal in this CAML Query is not returning correct records?

I have the following table:

DoubleNumber
-------------
10.50
44.77
88.90

I am using the following CAML Query:

query.Query = "<Where><Contains><FieldRef Name=\"DoubleNumber\"/><Value Type=\"Decimal\">44</Value></Contains></Where>";

Logically speaking, it should return no records. But, I dont understand why it keeps returning the second record.

Any idea?