We are fortunate that the regimental surgeon, Washington Lafayette Gammage, left behind detailed casualty lists from Pea Ridge to Chickamauga. The records indicate that Private Haynes suffered a gunshot wound in the groin at Murfreesboro. Surgeon Gammage reported the wound as "slight" -- sounds pretty serious to me, though. Ouch!
Surgeon's Gammage's records do not mention Private Haynes being wounded at Chickamauga. Given the detailed and reliable nature of his records, I think it's safe to assume that Isaac Perry Haynes was not wounded there, or, if he was, it was so minor as not to require the attention of the regimental surgeon.
You might be interested to know that Isaac Perry Haynes was a member of one of the first volunteer companies from Calhoun County, the "Calhoun Yellow Jackets" (named for that aggressive wasp that we Arkies are painfully familiar with). The company was organized at Hampton on May 25, 1861, and enrolled in State service for 90 days at Little Rock on June 10, 1861. It was assigned as Co. B, 6th Arkansas Infantry. When the regiment was transferred to Confederate service at Pocahontas on July 26, 1861, the Calhoun Yellow Jackets for some reason voted to disband, rather than transfer from State service to Confederate service. A new Company B was later added to the regiment, and most of the members of old Company B later enlisted in other regiments.