@ChloeMica, If you are defining source explicitly in inputs.conf then splunk uses that string to match not the original filename.
"Detail: This feature examines the source key; if source is set explicitly in the stanza, that string will be matched, not the original filename." - http://docs.splunk.com/Documentation/Splunk/6.3.1/Admin/Inputsconf
Could that be your case ?
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