I think one of the twin brother is not good at tying the knot, which is evident as said by Cutter:
"Some nights you just can't get it, can you? If that knot slips when Julia's on the hoist she'll break a leg".
So that night the twin brother who is not good at tying simple knots tied the knot. Both of the twin brothers are probably good at tying Langford double, so Borden proposes a change in the knot which eventually Cutter rejects.
In the next show of the same trick, as per answer here the twin brother who is good at simple knots is present and he tied a simple knot (also gave a glance to Julia without knowing the discussion his twin brother had after the previous show regarding the knot). Julia thought (per glance from Borden) that its a Langford double and underwater in the tank she tried to use Langford untie technique, but by the time she realized that's its a simple knot it was too late.
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