Measure-object Sum not returning Sum of array

I have an array that If I query a column, I get a list of numbers in return. If I place into Measure-Object, the Sum is not correct?

What is most efficient way to Sum this list of numbers?

 $array.'Profit'

Returns...

• 0.000
• 0.000
• 0.000
• 2387.500
• 1610

 $array.'Profit' | measure-object -property length -minimum -maximum -sum -average

Returns a list of numbers...

• Count : 5
• Average : 5.4
• Sum : 27
• Maximum : 8
• Minimum : 4
• Property : Length

Which the Sum doesn't add up?

What am I missing here?

Thank you for your time

If I take your example right, Profit being a single property in each array element, taking off the reference to length (-property length):

$array = 1.1, 2.1, 3.1 | % { [pscustomobject]@{profit = $_} }

$array.profit | measure -minimum -maximum -sum -average

Count    : 3
Average  : 2.1
Sum      : 6.3
Maximum  : 3.1
Minimum  : 1.1
Property :

Or

$array | measure -property profit -minimum -maximum -sum -average

Count    : 3
Average  : 2.1
Sum      : 6.3
Maximum  : 3.1
Minimum  : 1.1
Property : profit

Minimum, maximum, sum, and average end up as instances of type [double].

$array | measure -property profit -minimum -maximum -sum -average | % sum | 
  % gettype

IsPublic IsSerial Name                                     BaseType
-------- -------- ----                                     --------
True     True     Double                                   System.ValueType