Structures not behaving as value types

I have a VB.Net declaration of a structure strFieldMask. The intended
purpose is to store a bunch of bits, like a bit vector. The structure also
has operator declarations for =, <>, And, Or, Not and <<, plus some other
methods for bit manipulation.

The problem is that variables of type strFieldMask seem to behave as
though there was a singleton strFieldMask and all instances shared it.

Consider this:

Dim Mask1 as strFieldMask
Dim Mask2 as strFieldMask

Mask1 = (formula for computing the next unused mask value)
Debug.WriteLine(Mask1.ToString))
Mask2 = (same formula)
Debug.WriteLine(Mask1.ToString)) ' Yes, Mask1, not Mask2

The result from the first WriteLine might be "0x10" and the result from
the second WriteLine might be "0x20".

I've successfully used structures before, but this is the first time I've
tried overloading the operators. Has that caused the behavior I'm seeing?

Thanks.

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