IF function with > returning random results

SELECTEDCOMPANY[Revenue_LastDate_%ofPeers] and SELECTEDCOMPANY[Revenue_FirstDate_%ofPeers] are both measures in a table which is being filtered by various slicers. Each of these producers a % which works correctly. Each returns the % of revenue a selected company is responsible from the total revenue of several companies at a specific date. 

An example of a what I'm getting is (red text added for clarity) - 

SELECTEDCOMPANY[Revenue_LastDate_%ofPeers] = 13.23%
SELECTEDCOMPANY[Revenue_FirstDate_%ofPeers] = 9.67%

And the if statement ...

IF(SELECTEDCOMPANY[Revenue_LastDate_%ofPeers] 13.23% >SELECTEDCOMPANY[Revenue_FirstDate_%ofPeers] 9.67% , " It's position strengthened relative to its peers " , " It's position weakened relative to its peers ")

The result should be result... " It's position strengthened relative to its peers " but it's returning "It's position weakened relative to its peers"

Here are some examples of other results I get based upon the two measures (SELECTEDCOMPANY[Revenue_LastDate_%ofPeers] and SELECTEDCOMPANY[Revenue_FirstDate_%ofPeers]) which shows the ranom results I am getting:

Any ideas?