Agreed, it's very odd, I think it is something to do with protecting the ref unless he makes a clear and obvious mistake, which of course he did, all very confusing.
Yesterday there was a mixture of VAR making totally the right decision and others like the Leicester v Spurs disallowed goal that was a millimetre off side.
I have gone from 60/40 in favour to 50/50.
But it was a millimetre offside.