Hi Bernard,
I’m on a flight, so only using my phone (and can’t easily see the construction of the indicators involved), but DHIS2 normally calculates numerator and denominator, then divides the former by the latter. So my guess is that the “total” simply adds up the sum of all numerators and divides this by the sum of all denominators.
Since some of these indicators presumably use the same denominator, that data will only be counted once when the total data is summed (even if it was re-used again in two or more columns), so the “sum” of the denominators will be undercounted, leading to the inflation of the coverage percentage.
This is just a guess - can you check it?
Cheers, Sam.