Since the last update of Garmin Connect for iOS some characters are not shown correctly in the "name" of the activity:
Before update: "hike activity" => Slovenian: "Place" Pohodništvo
After the update: "hike activity" => Slovenian: "Place" Pohodništvo
Note that the activity type itself is still with the correct characters: "POHODNIŠTVO". So the error is obviously in the part where the name of the saved activity is generated.
I already wrote to the support - post it here cuz I'm hope that someone from Garmin will take a look.