Crack in concrete block garage wall
Yes, you should be concerned. Cracking like this is caused by movement (the structure has moved, such as settled) and this type of cracking is unusual. This needs to be reviewed in person by a structural engineer who can look at the particulars of your situation. This is not something that you can get a good answer for here on this or other sites.
FWIW, I'm a structural engineer. I'd be interested in what they have to say about it