It's not the training bug. It's just how development works, only at a grossly exaggerated level due to the huge jump in his projections.
When Mr. Smith received his double DITR, his "physical" attributes (the ones that develop as a function of age, training, and distance between current and projected) were:
Range: 48 --> 90 (increase of 42)
Arm Strength: 37 --> 52 (increase of 15)
Power: 34 --> 84 (increase of 50)
In his first two rollovers since the double DITR, his progression in those three ratings has been:
Range: 48 --> 61 (+13) --> 74 (+13)
Arm Strength: 37 --> 40 (+3) --> 42 (+2)
Power: 34 --> 55 (+21) --> 69 (+14)
So we can see that for the most part they are starting to "slow down" the closer he gets to projected. I'm sure that we'll see even more slowdown after the next rollover in a couple of months.