Receiving files with recursive = yes does not create subdirectories and transfers all files in the top directory

If I have a tree

./aa/bb/b1.txt
./aa/bb/b2.txt
./aa/a1.txt
./aa/a2.txt
./1.txt
./2.txt

in the source directory and I will receive these files with the parameter 'recursive=yes' then I get

./b1.txt
./b2.txt
./a1.txt
./a2.txt
./1.txt
./2.txt