I've noticed this as well and I have a theory.
So we know that the packs will either add or remove moisture to maintain the target humidity. I think if the curing bud is actually a little too much on the wet side, then the Boveda packs have to draw in that moisure aggressively to maintain the target humidity. Perhaps this action also "sucks out" some of the smeĺls.
Maybe if the bud is allowed to get to a true 62% on it own, through normal open-room drying and then days in the jar with regular burping and monitoring, and then the Boveda packs are only added to maintain the already near perfect conditions, then they'd draw less smell out of the buds.
Like I said, just a theory. Also, it has occurred to me that getting the bud to 62% naturally may be all that is required. In a sealed jar, it shouldn't change much unless there are big temperature fluctuations. So maybe no need at all for the Bovedas when we put in the effort to "do it right".