This is how the app shows the data in the main page: objective 150 minutes (and the orange bar shows that the objective is met, with 169 minutes)
If you click for details, you see different data: the goal is 250 (not 150) and it's not met:
Indeed, 250 is the right value, also visible on the Garmin Connect web site.
The same view, from the Garmin Connect website, with the right objective (250 minutes)
Ah, OK 
In tha case, it could be perhaps also due to a mixup of two different accounts you signed up by mistake. Usually there are other symptoms, like missing HR data or steps, but perhaps this could be one of the symptoms too - frankly told I never saw such case yet, here on the forum.
The mixup of several accounts frequently happens for example when you reinstall the application, and inadvertently sign up a new account instead of signing into the original one. You can try following the instructions from the support document Data is Missing from My Garmin Account After Syncing to resolve the issue.
