SAMPLEPERIODLASTYEAR pulling FULL year - not previous YTD

[heathernicole]

I am trying to compare YTD sales to Previous YTD sales. 

YTD formula:

SalesYTD = 
CALCULATE (
[Incoming Total Sales], 
FILTER (
ALL ( 'Calendar - Transaction Date' ), 
'Calendar - Transaction Date'[Transaction Date Year Number] = MAX ( 'Calendar - Transaction Date'[Transaction Date Year Number] )
&& 'Calendar - Transaction Date'[Transaction Date] <= MAX ( 'Calendar - Transaction Date'[Transaction Date])
)
)

PYTD Sales = 
CALCULATE (
    [Incoming Total Sales], 
    FILTER (
        ALL ( 'Calendar - Transaction Date' ), 
        'Calendar - Transaction Date'[Transaction Date Year Number] = (MAX ( 'Calendar - Transaction Date'[Transaction Date Year Number]) -1)
            && 'Calendar - Transaction Date'[Transaction Date] <= MAX ( 'Calendar - Transaction Date'[PY Date])
    )
)

However - the PYTD measure (no matter what variation I do) is pulling the FULL year for last year

Even using SAMPLEPERIODLASTYEAR. I can NOT figure out why it's doing that rather than pulling JUST the data for YTD LAST year. 

Previous Year Sales (Incoming) = CALCULATE([Incoming Total Sales], SAMEPERIODLASTYEAR('Calendar - Transaction Date'[Transaction Date]))

ANY ideas as to WHY it's behaving this way? It's the same on EVERY report I have.