here is what I am seeing btw - maybe there is a problem on the Flipside side because the code looked like it was supposed to display the data from the past 60 days
aha i see what you mean now - the blue chart which is “TPS” per chain?
from what i can see, they are working out the TPS per day similar to the way you did. What I am guessing has happened here is that they have summed all the daily TPS figures but not divided to get the average.
For Sei then, 2490 total TPS / 52 = 47.88 avg TPS which looks reasonable.