Not sure... I have noticed the primary kicker is usually located on the right side if they're a right footed kicker (Cleary, Moses, Cronk, Pearce, Arey, etc.). Conversely Norman, Wighton, etc. sit on the left with their left foot kicking
Keary sits on the left, but Flanagan did all the kicking last year. SJ sits on the right even though Chad is probably the primary kicker, but that's probably carry over from his warriors days and it's where he's most effective so he should be staying there anyway.
The only player I can think of from recent time that really bucks the trend is JT, because Morgan sat on the right, but JT was definitely the primary kicker. In saying that JT played the traditional halfback role roaming either side of the ruck so he could just move himself to the correct side before his kick
Potentially they do this to get the kicker's foot away from the inside chasers (right foot kicker has markers coming from their left).
Also so they're not kicking back against the grain so to speak (ie. Milf getting it on the left side of the ruck, but wanting to kick to the right side of the field would have them kicking into the kick pressure) all but ensuring they're going to cop a shot after kicking, but also disrupting their ability to kick with forward momentum (don't want them running into the kick pressure to get their kick off).
Potentially Milf has just been playing left because Hunt was our halfback and primary kicker so he was on the right.