I wouldn't read too much into it because there can be many factors involved, including just plain administrative or procedural errors, but according to the WB website Height and Weight stats here are the variations from last year's official list:
Bailey Smith - 1 cm shorter (now 185) and 1 kg lighter (now 82)
Zaine Cordy - 4 kg heavier (now 90)
Buku Khamis - 1 cm shorter (now 189) and 1 kg heavier (now 80)
Ben Cavarra - 2 cm shorter (now 173)
Billy Gowers - 1 kg lighter (now 87)
Lachie Young - 1 cm shorter (now 189)
Jordon Sweet - 2 kg heavier (now 106)
However the most mystifying - and pretty obviously wrong - is that Tim English is still listed as being 93kg. I'm pretty sure someone posted on this board that he is now over 100kg, which sounds about right for a 205cm ruckman heading into his fourth season.
Maybe they'll do another update in Feb?
All that technology from VUT, yet we’re still using Mrs Grobecker’s measuring tape from 1954, then converting imperial to metric, and the dodgy scales from 1975 that once listed #11 Ivan Rasmussen at 94kgs!