It’s a pity that Morgan Toney hasn’t made any comment. The notation is not right, I’m afraid. It’s likely that the transcription comes from a fiddle collection from 1981: The Caledonian Companion (by Alastair J Hardie, Edinburgh). The trouble is that this tune demonstrates scordatura, so the G string would be tuned up to A, making the first two notes C and A, not B and G; the D string would be tuned up to E, so all the notes in the above transciption below A are wrong. Hopefully Morgan Toney will return to correct it.
The tune is old, published as "Kilrack’s Reel" (McGlashan 1778); "Kilrack’s Strathspey" in Gow’s 1st collection (1784); "Kilravock’s Strathspey" (Anderson c1790) and "Kelravock’s Strathspey" (Beauties of Gow 1819).