For some reason the storymap titles in a collection not fitting in a single line are showing the text in the second line cut off. All themes have this same problem.
I can't tell exactly when this started to happen but I'm sure it was working well in mid December.
See an example:
Solved! Go to Solution.
This issue was addressed in yesterday's update. Release notes—ArcGIS StoryMaps | Documentation
@AGP - We are aware of this issue and are already working on a fix for an upcoming release.
This issue was addressed in yesterday's update. Release notes—ArcGIS StoryMaps | Documentation