What am I missing in my formula? (My formula is multiplying the answer by 33.)

What am I missing in my formula? For some reason when cell I2=3, the total from cell BT38 is being multiplied 33 times. When cell I2=C, the answer is correct. (Adds up cells BS3 to BS35.)

=SUMPRODUCT(('Teacher 1'!$I$2="C")*('Teacher 1'!$K$3:$K$35=3)*('Teacher 1'!$BS$3:$BS$35)+('Teacher 1'!$I$2=3)*('Teacher 1'!$BT$38))

The way this formula is post to work is if cell "I2" has PK, K, 1, 2, 3, 4, 5, 6, 7 or 8, it will post the total from cell "BS38" and if cell "I2" has a "C", then it adds BS3 through BS35 that have a "3" in cell "K3" through "K35".

In this link, the answer in G41 should be 1947, not 64251.
http://i694.photobucket.com/albums/v...ps4b91c04c.jpg

In this link, the answer in G41 is correct. It adds column from BS3 to BS35.
http://i694.photobucket.com/albums/v...psf001cc1a.png

* I did hide some rows and columns to make the pictures smaller.

Here is the link to my sample spreadsheet

he way this formula is post to work is if cell "i2" has pk, k, 1, 2, 3, 4, 5, 6, 7 or 8, it will post the total from cell "bs38" and if cell "i2" has a "c", then it adds bs3 through bs35 that have a "3" in cell "k3" through "k35".

=if(i2="c",sumif(k3:k35,3,bs3:bs35),"")

????