Greetings @Gramps This is part of the new update and will hopefully support the recent changes to the Tournaments by allowing you to train an increased amount of troops!
The Trainign Grounds in one of my worlds is faulty. It shows all four slots full, with one slot flickering and counting over 60000 seconds backwards, sorry, not really sure how to better describe it.
Greetings @Fester we were having a slight issue yesterday with the most recent update rendering some training grounds inoperable. If you could delete/clear any troops out of your queue, and then refresh your game (if you haven't already) see if that works first and foremost!