Strange problem with acciaccatura slur

[Nick Payne]

See the acciaccatura slurs in the attached png. I can't figure why the
second of the slurs sits up above the stems, as there is nothing I am doing
to make that happen. I tried to get a minimal example that shows the
problem, but when I excerpt the relevant source notes from the treble voice
(below) on their own, the problem doesn't happen. I'm using 2.13.3.

<g-4>8 <f-1> \acciaccatura g <f-1> <e-0> |
\acciaccatura <f-1> e <d-4>\> \acciaccatura <e-4> <d-1> <cs^4\3>\! |

Nick

strange.png
Description: PNG image