How to decrypt files that i can decrypt?

i have two test files on my computer:
a.dat
b.dat

i am the Owner and have Full Control over both files. Both files are encrypted with the same Encryption File System Certificate:

efsinfo /C

a.dat: Encrypted
Users who can decrypt:
JOSE-PC\Administrator (Ian)
Certificate thumbprint: 1E01 673B B646 8FBA 21A6 122A 2D1F 0629 7229 914D

b.dat: Encrypted
Users who can decrypt:
Unknown (Ian)
Certificate thumbprint: 1E01 673B B646 8FBA 21A6 122A 2D1F 0629 7229 914D

My login uses that same EFS Certificate:

efsinfo /Y

Your current EFS certificate thumbnail information on the PC named JOSE-PC is:

1E01 673B B646 8FBA 21A6 122A 2D1F 0629 7229 914D


And yet one file i can decrypt (open, read, decrypt), the other i cannot. What gives?


i know: these unanswerable questions suck.

.

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