Campincanada,
I see that Folster Charles has been enumerated twice in 1911 and both 1911 entries are separately linked to another record i.e. each of the have their own link ID:
A)
1906-1911-Birth record having link ID (UID) 150503979; and
B)
1911-WW I having link ID (UID) 700251942.
Note that a census record may only have one associated UID; thus the cause of the problem you reported of not being able to link the second 1911 entry to the 1906 entry.
As it is currently very late, I will fix this problem in the next few days and have all five records linked together.
I will advise when it is done.
Cheers,