The others are right, the right cup backed off and you took up the slack on the left. It's easy to fix and you can do it yourself if you have a crank remover and the correct wrench for the right. It looks like a 3-notch cup so you might do the job with the crank on turning the cup with a hammer and punch. This seems like a crude technique but was standard practice when this BB was made.

The key is to remember that the right cup is always set tight to the frame, and the bearing adjustment is done from the left. DSo before you start back out the left cup so the spindle is sloppy before you bring the right in. If turning the right eliminates play, back off the left more and continue so you're tightening the right without tightening the bearings. When the right side is home, you can finish the job using the adjustable cup and lockring.