Hi,
I made all the tests below, using 5 LL fans.
Fans are A, B, C, D ,E.
Fan Hub
1 . A
2 . B
3 . C
4 . D (not working)
5 . E (not working)
When I switch Fan D or E to 1, 2 or 3. It is working.
When I connect Fan A, B, or C, to position 4 or 5. It doesn't work.
So pretty it is a problem with FAN HUB with 4, 5, 6 positions.
I always keeping fans connected to 1,2,3 in sequence in order to have 4 and 5 connected.