RANKX fucntion returning false ties

[calleylmurphy]

Hello,

I'm trying to use the RANKX function for the fist time, and am getting ranks that show up as ties when they are clearly different values.  I'm using this formula:

Rank = RANKX(ALLSELECTED('Test Table'),[TestValus],,DESC,Skip)

...And here's what I'm looking at as a result:

TestValues   Rank

8,528.130     1

7,880,684     2

5,658,992     3

5,501,675     4

4,035,689     5

5,345,703     5

3,959,043     5

3,929,863     5

4,496,415     5

3,431,168     7

In general it seems to be working, but I can't figure out why I would be getting random ties for values that are clearly not the same.  Does anyone know why this might be happening?