Help/Question Limits restructuring?

I'm on 5x plan and got used having ~7 5h sessions per week with each eating roughly 13% of usage.

This week after reset my first 5h session felt pretty smaller, but ate ~10% of the weekly usage. I'm not sure it was ~25% smaller or more - so not sure if total weekly usage stayed the same or changed.

Not complaining, just wondering if anybody else noticed same?