My trigger is not insert value into correct row

hello,

I'm trying to write a trigger that get a QuoteNumber from table 1 and insert it into table 2 where ShippingIdentity matches the records in both tables. The problem is the QuoteNumber is being inserted into it's own row(record) Can anyone please let me know why? Thanks.

ALTER TRIGGER InsertQuoteNumber

ON AccountInfo

FOR INSERT

AS

BEGIN

INSERT INTO ShippingInfo (QuoteNumber)

SELECT a.QuoteNumber

FROM AccountInfo a

inner join inserted i on a.ShippingIdentity = i.ShippingIdentity

END