That may have something to do with it! shorten those stirrups up silly!
Lauryn started out riding in a western saddle, I will never forget the first night in the English saddle, we thought she would come off of it when she went in to the canter, but she was completely at ease. Now she's so use to it if you put her in the western she does nothing but complain!

Thunder 13yr old Standardbred Gelding
Sportys Marie LaVeau 8 yr old Reg. QH
Stormy 3 yr old Arabian
April 26yr old QH
Binks 18 yr old TWH/Morgan