DAX measure like for like previous period totals

Hi,
In a recent video like for like same period last year measures were created;

so if current year only has 6 month the total for prevous year should aslo just have those months

this was ;

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But I also tried the following which does give ( i think) the correct start and end dates but for the total I only get the last figure, I have highlighted this in the Pivot attached;

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Can someone see why I'm getting the wrong result, secondly is there a way apart form the 'IF' statement I've use to get ride of the unwanted figures
I have highlighted these in orange, can someone tell me how they are calculated;

Richard.

Richard.

Thank you,
as so often it's obvious, ONCE SOMEONE ELSE HAS POINTED IT OUT. 🙄