why does the word s h i f t come up as [zb] ?
Shift shift
It doesn’t 
tachograph,
You’re quite right, and there’s underlined proof in ROG’s own post:
I’m not always the brightest when it come to I.T. techy stuff, but I have a theory about this…
ROG is retired, so the auto censor might have thought that ROG meant that HE was putting in a shift so it did its job properly because it thought that it had caught ROG swearing. 
It’s only a theory, so I can’t prove a word of it.
Did you post on mobile and predictive text took out the F
You can’t even say you went Scunthorpe without activating the swear filter…oh it seems you can 
Blimey, the c word is allowed
Well, zedbee me!
It is ok now but it was not at time of posting 
Think we are also allowed [zb] but only in small doses, bit like the wife when she let’s me visit her Scunthorpe.
Guess what…your not Thanks for the donation to the auto censor. Colingl