COUNTIFS function w/greater than or equal to, and less than or equal to time values

Hello,

I am new to this forum and am just beginning to explore all the functions of Excel 2007 (so my terminology and understanding may not be up to par).

I am currently creating a workbook that will pull data from patient sign in times to see how long their wait time was, to improve our offices efficiency.

I want to count patients at different time intervals to see which step in our prep process takes the longest:
0-3 minutes, 4-6 minutes, 7-9 minutes, and >10 minutes

Example; The formula that I have in my cell is: =COUNTIFS(E2:E18,">=0:04",E2:E18,"<=0:06") which pulls 2 patients. However, when manually counting the data, the total amount of patients should be 3

Is there another formula I should be using?

I also tried: =COUNTIFS(C2:C18,">0:03",C2:C18,"<0:07") but that is counting the data for 3 minutes and 7 minutes, which I don't want.

If you view the attachment: The data and formulas that I have in the total wait time section works perfectly with the same formulas described above.

Very confused here,
Thanks