Plugin press percentages perplexity

I’m about 10 weeks into NLP and started the plugin last week.

The press percentages seem strange to me, so I’d like to check that I’m understanding it correctly:

The Workout A press for 8x4 is 88% of the last 5x3 (100%-12%), and the Workout B press for 4x6 is 89.25% of the last 5x3 ((100%+5%)-15%).

It seems weird that it’s such a similar weight for 8 and 4 reps. Is it because of the initial single in Workout B, or am I just missing something?

Thanks!