XTEA Microsoft.SPOT.Cryptography

I assume that Microsoft.SPOT.Cryptography.Key_TinyEncryptionAlgorithm is based on the XTEA method.
Problem that I am having is this:
Insert 4 digit short or int into array, starting at position 0 then a second 4 digit int or short into array starting at position 4 then create a key using a 12bit byte array and insert it into a 16 place byte array. setting the last four places to byte 1,2,3,4. Then encrypt data using 8 byte array, 16 byte key, and a 8 byte Intialization Vector.
The decrypt result sometimes returns a wild value. like instead of 20.00 a result like -30245673435.00
(1) Is Microsoft.SPOT.Cryptography.Key_TinyEncryptionAlgorithm TEA or XTEA?
(2) Are there known collisions using this encryption?
(3) Since I passed it a 8 byte array does the result ever yield more than 8 bytes?

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