Just came over an odd behavior.
Geometry for the route and alternative looks good, but the steps are wrong. Happens on my own instance and on the demo-page:
http://map.project-osrm.org/?z=8&center=50.159581%2C10.023680&loc=52.120056%2C8.667266&loc=48.115082%2C11.508351&hl=de&alt=0

Reversing the route, the directions are fine.