Gracenotes and Triple-Stops for Strings

When using appoggiaturas the length of the gracenote during playback is inconsistent. Sometimes it will play it very very fast or play it the entire length of the note regardless of whether the gracenote is a quarter, eighth, sixteenth note, etc.

The only way that I've found to get the playback to do the standard triple-stop/quadruple-stop technique of playing the bottom 2 notes and then the top two notes is to use gracenotes which are very inconsistent.