countif/sumif issues

Hello,

My data is on Sheet2 Column A is transaction date and column B is number of units. My summary page has periods listed as Jan 1-31, Feb 1-28, etc... I'm trying to first count the number of transactions per month using

Formula:

{=COUNT(IF(MONTH(Sheet2!A:A)=MONTH(DATEVALUE(LEFT($A9,3)&"1")),1))}

and second sum the number of units per month using

Formula:

=SUMIF(Sheet2!A:A,"<="&DATE(2015,MONTH(DATEVALUE(LEFT(A9,3)&"1")),TEXT(EOMONTH(MONTH(DATEVALUE(LEFT(A9,3)&"1")),0),"d")),Sheet2!B:B)-SUMIF(Sheet2!A:A,"<"&DATE(2015,MONTH(DATEVALUE(LEFT(A9,3)&"1")),1),Sheet2!B:B)

The transaction count seems to be working fine with the exception of Jan 1-31. It's returning a number in the millions when it should me 700.
The sum of units looks like it's working for April but the other months are all over the place.
I've attached the file also.
Book2.xlsx
The real reason I want to automate this is because prior month transactions can change, some can cancel which would reduce transactions, units and sales and sometimes an individual transaction can change which would move the number of units and sales. Ultimately I want to just have to copy and paste the raw data and then only need to look at the current month's activities because those will be listed by week. I also have to repeat the process about 4 or five times for different data sources. Any thoughts to what could be causing the issues I'm having or potentially another way to return the same info would be greatly appreciated.

TIA
Tristan