i can't see anything wrong. i'll keep looking and let you know by PM if i finally find anything but i think it's fabulous!
never think your result with a block is wrong just because it looks different. (your is different from mine because yours is BETTER. LOL)
the trick to templates is cutting them exactly along the lines. some people use freezer paper. i printed mine on sticker project paper. no particular reason.
i also discovered something else. it pays to make sure all your fabric is facing in the same direction (all face up, or all face down).
it helped, too, to starch the fabric before putting down the templates and cutting. the fabric cuts more precisely and the pieces hold their shape better. when they're cut just right, they fit together like puzzle pieces. if they're a little off ... not so easy.
i had never used templates before, either. so much fussy cutting seemed too much like work. but they make more sense (to me) when making only one copy of a block. then it's less work because there's no math for rotary cutting.
some methods work better than others for different kinds of blocks. i just started a new quilt. i've used templates for some of the pieces; paper pieced in other places; and rotary cut/strip pieced for others. so far (knock on wood) it's going together better than almost anything i've done before.
honestly, Mary, i can't see any mistakes in your block. all i see is pretty.
:-)