Here's a work-around that fixed my map wich needed to clip the top 10 hex rows.
1) First increase the bottom margin with 10 hexes (this gives you a 10-hex 'buffer')
2) Then clip the top margin with 10 hexes (this leaves your original lowest 10 rows untouched)
3) Finally clip the bottom margin with 10 hexes to remove the 'buffer'.