Must be because Sergei Shoigu stole from the Wagner funding. Per recent articles it turns out that Sergei Shoigu and his underlings have been the most thieving from Russia's military budget.
The media told how Shoigu and his entourage stole 80% of the money for the war (video)
The posted article contains a lot of information about the Wagner group and recent recruiting of murderers. There are also several pictures and more information about Putin and the current marketing effort to the world of Russian tanks and other arms. Mentions other countries are concerned about competence of Russian weapons after seeing the current war.