Ok, thanks for your clarification.
There are indeed a few users who have enough 250-votes, but not enough 10-votes to reach a total of 10, but in most cases they lack 250 Merit votes.
Yes, makes sense. A single 250-Merit vote can be splitted in multiple 10-Merit votes but not for the same person. At first, I thought if someone has earned 260 Merit and includes someone in his trust list he should be able to vote one time 250 Merit and one time 10 merit.
But it looks like it isn't calculated this way, otherwise everyone would have at least the same number of 10-Merit votes as he has 250-Merit votes, so I assume every account can only vote one time for another account either it's 250 Merit or 10 Merit.
For example, I have 5 users 250 Merit+ but only 4 users 10-249 Merit.
78. 1miau (352 Merit earned) is included by 5 users with 250+ earned Merit and 4 users with 10-249 earned Merit.