Strange rename behaviour when using date created twice

Not sure if this is a bug but I'm puzzled by the renaming files behaviour using the date created pattern twice in one rule.
When applying the pattern 'Company (date created #1>) YYMMDD - Subject (date created #2>) MMMM+1 YYYY' the year-patterns seems to influence each other.
The result will either be 'Company 120424 - Subject May 12' or 'Company 20120424 - Subject May 2012'. I can't rename it to 'Company 120424 - Subject May 2012'.
Anyone else who stumbled upon this?
Edit: Even more confused. I have created another rule with slightly different conditions but same rename syntax and this one is working as expected.
Just to make sure I triple-checked and rerun it on my test file. Still the renaming issue. Disabled this rule, duplicated my working one, edited the conditions and now it's working. Maybe it's just a glitch after to many edits of a single rule using the trial and error method. Lesson learned.
When applying the pattern 'Company (date created #1>) YYMMDD - Subject (date created #2>) MMMM+1 YYYY' the year-patterns seems to influence each other.
The result will either be 'Company 120424 - Subject May 12' or 'Company 20120424 - Subject May 2012'. I can't rename it to 'Company 120424 - Subject May 2012'.
Anyone else who stumbled upon this?
Edit: Even more confused. I have created another rule with slightly different conditions but same rename syntax and this one is working as expected.
Just to make sure I triple-checked and rerun it on my test file. Still the renaming issue. Disabled this rule, duplicated my working one, edited the conditions and now it's working. Maybe it's just a glitch after to many edits of a single rule using the trial and error method. Lesson learned.