Hi,
Good spot - the clue is the name - Barton Turnover Bridge #36!
I've clear survey images from 2016 showing the towpath next to the A38 from Wychnor to #38.
I suspect the original (pre-imagery?) mapping mis-counted the bridges.
https://www.openstreetmap.org/way/93768220/history#map=15/52.7682/-1.6991&layers=N

Happy Mapping,

James