Ohio Civil War Volunteer Infantry

My 2x Great Grandpa, John Bandy born 1846 is shown in the "US Civil War Soldier Records Profile 1861-1865" AND in the "US Civil War Pension Index to Pension Files  1861-1934", to have served in the Ohio 135th Infantry AND the Ohio 180 Infantry. However, in his obituary it states that  he was a member of the 46th OVI. I am confused.  How can I clear this up for my records.?