Printing Cells with TRUE/FALSE results in 1 and 0

Hi everyone. I have an issue when printing Excel files that I can't seem to figure out. There were several hundred Excel documents that were printed, and I've noticed on a few of them, for fields that have a calculation resulting in either TRUE or FALSE, Excel has printed them with a 1 or 0 rather than the text equivalent.

The problem is that since there are so many documents to go through, I'm not exactly sure how many of them are affected. Going through a sample of them I only noticed it in about 5% of the cases.

So my question is, what would cause the documents to be printed in this manner? I need them to print TRUE/FALSE. I noticed this in Excel 2007 files so far, so I'm not sure if the problem is only isolated with that program, or could affect earlier versions.

A sample of the cells contain something like this:

=SUMIF(SUMM!$B$369:$B$542,$A184,SUMM!$F$369:$F$542)=SUMIF($A$2:$A$202,A184,$D$2:$D$202)

The formatting for these cells are set to Custom and looks like this:

_(* #,##0_);_(* (#,##0);_(* "-"??_);_(@_)

When I open the file in Excel 2007, the values of those cells come up as TRUE or FALSE, and get printed as such.

My question is why did it print it as 1's and 0's before? I believe these files were printed from another machine but I'm not 100% certain. Essentially I'm trying to find the cause of the problem so that I could fix it and avoid this from happening in the future.