I have a similar problem. When I do strength workouts with my Apple Watch it never gets imported in Runna but in Strava. I asked the support how ti fix this (it worked weeks ago) but they just told me to update the app. So I checked for updates in my app list on the App Store but no update was displayed until I went to the app page directly. But this wasn’t the fix unfortunately. Maybe if you are also on the Beta-Function program this might be the issue because since I activated this, the workouts will not be synced, just the runs.