That's not how the seeding at Wimbledon works. They also take into account the entire last gras season and the best tournament of the season before that.
Every Year the same explaniation
The TOP 32 of the Rankings are seeded, the formular of wimbledon only orders the Top 32.
That's why Karlovic for example would now be seeded at 21. Bu if he would drop out of Top 32, which is not gonna happen probrably, he will be unseeded.
There's a thread here in GM where you can see this, just search for two minutes