Has anyone ever seen this problem before.

IF USED("TableName")
SELECT a
ELSE
SELECT b
ENDIF

After these lines of code Table c is selected. There is only one work area.
We have a work around, because if you specify the work area in the select statement, it works fine. I would just like to know if anyone else has ever experienced this problem before. I mean, it is an if else statement, how in the world can c end up being selected. Thanks for any input.