Problem with Slicer Value

I am creating a meausre based on some slicer values that a user chooses. The following calculation returns the correct value based on the slicer selection. I am then trying to use this value elsewhere. However, if I apply any other function to it, it no longer gives the correct value, but the False result part of the calcution.

The calculation I am using is as follows:

testselectedValue =
DATEVALUE(IF (
ISFILTERED ( 'Date Test'[Month] ) && ISFILTERED ( 'Date Test'[Day]) && ISFILTERED ( 'Date Test'[Year] ) ,
DATEVALUE(LASTNONBLANK('Date Test'[Date1], 0 )),
DATEVALUE("12/31/2999")
))

As a simple example, if I do a simple calculation like TESTCALC = CALCULATE('Date Test'[testselectedValue]), it uses the False value from the above 'testselectedValue' measure.

Again, if I check the value on a card of the measure result, it gives the right value, but if I use it as a part of another calcuation, it uses the False result to the measure, 12/31/2999.

Thoughts?