Horns condensing issue

Hello! I’m running into an issue with condensing in Dorico 5.1.32. As shown in the screenshots below, condensing gets into trouble when there’s a melody line in 1 horns, while 3 are playing a rhythmic pattern. My first assumption for the reason is, that horn 3 plays above 1 and it messes the calculations somehow.

Would you have a suggestion for this? I already tried adding a condensing change & custom condensing groups, but it didn’t have an effect on this. Attached is also the project file. Thank you kindly in advance!
SuomenKesä_150524.dorico (2.1 MB)

Screenshot_1581
Screenshot_1582

Setting the horns to a standard 1, 2, 3, 4 configuration solves the problem.
SuomenKesä_150524_altered.dorico (2.2 MB)

Thank you for the reply, that indeed worked! On this project it would be preferable to have them in 1,3,2,4 - but I very much appreciate the solution and will be going with that!