Yep, this is a great long term program where there will be some cycles that not all lifts go up.
The book describes how to handle this scenario better than I can, but...
When one of my lifts don't get stronger in a cycle I usually approach it a few ways depending on what my body is telling me:
1. If my lift didn't increase as expected, but I feel like I didn't necessarily push the lift as hard as I should of through the month (for whatever reason) - INCREASE TM AS PRESCRIBED and hit make it my mission to get this lift stronger
2. If my lift didn't increase as expected, I gave it my all but I don't feel beat up (no muscle soreness, joint pain, etc) - MAINTAIN CURRENT TM for the next cycle.
3. If my lift didn't increase as expected, I gave it my all but my knees, CNS, lower back, etc are screaming at me - DROP TM BACK A CYCLE and work my way back up through the plateau (ideally)
Again, these are just a few tactics I've tried while running this and other similar programs and have seemed to keep my lifts growing.
Hope some of this info helps you!