Like Rick I didn't count generics, only specific types. So my count is as follows (numbers added 27/11/21):
1/32
1st - Hanriot HD-1 (17)
2nd - Albatros/Oef D.III, Breguet XIV and Halberstadt D.II tied (10)
3rd - Royal Aircraft Factory BE.2 family (8 )
1/48
1st - Sopwith Pup (5)
2nd - Royal Aircraft Factory RE.8 (4)
3rd - Avro 504k, Caproni Ca3, Curtiss JN-4 Jenny, Hannover CL.III, Hannover CL.II/III and Royal Aircraft Factory FE.8 tied (2)
1/72
1st - Spad VII (4)
2nd - Sopwith Pup and Albatros C.X tied (3)
3rd - AEG C.IV, Albatros C.XII, Albatros D.III, DFW C.V, Fokker D.I/II/III, Hannover CL.II, Morane N, Morane P, Royal Aircraft Factory FE.2 and Salmson 2A2 tied (2)