Weirdo, but I fixed it changing the filter from A to B
A) OU=Sao Paulo,OU=Brazil,OU=South America,DC=haygroup,DC=com
B) OU=Computers,OU=Sao Paulo,OU=Brazil,OU=South America,DC=haygroup,DC=com
Taking into consideration that Lanweeper will scan only computers on the specified paths, the option A would work fine, wouldn't it?
Besides that, with the option A in place, Lansweeper scan ALL computers from the domain and doesn't respect the filter.
Did I find a bug?