NO - what I'm saying, and if they don't change it in the meantime, our daily interest is 0.6%.

In my above presentation, if you started with zero - any percentage of interest the next day would be zero.
If your 1st day earning is only 0.100 SP, 0.6% of that amount is 0.0006 SP.
As SP is shown only with 3 decimal places the interest of 0.0006 wouldn't be shown on the 2nd day. But if you earned additional 0.100 SP on Day 2 that makes a total of 0.200 SP you would be holding.
Therefore, on a 3rd day, your daily interest would be 0.0012 SP calculated on your 0.200 SP total, meaning your new total would be 0.201 + whatever you have earned (by voting, commenting and curating) in the previous (due) day.
Upon that newest total will be calculated the interest for your 4th day, and so on...