The water behind it must go somewhere. Are there no drainholes (weep holes) built into your wall?

There should be a gravel plane behind the wall to drain the water to the bottom, then enter a pipe to exit somewhere else. This not only will prevent soil from staining the wall face as it is carried with the water, but relieve hydrostatic pressure against the wall. Note during the initial, or after some drying of a rain, you may get some streaks, but from so many of your streaks starting at a horizontal joint it must be because there is no drainage plane behind the wall.

No it was not. I just hired the company to build it. He did put gravel and rocks in behind it and there’s a drain pipe that I believe has holes in the top for drainage.