Does List guarantee insertion order?

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The List<> class does guarantee ordering – things will be retained in the list in the order you add them, including duplicates, unless you explicitly sort the list.

According to MSDN:

…List “Represents a strongly typed list of objects that can be
accessed by index.”

The index values must remain reliable for this to be accurate. Therefore the order is guaranteed.

You might be getting odd results from your code if you’re moving the item later in the list, as your Remove() will move all of the other items down one place before the call to Insert().

Can you boil your code down to something small enough to post?

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