For some reason my pack had multiple stacks of stack of coins. I had a stack of regular sids and two stacks of smelly sids which merged into a stack of regular sids when I get them all from my pack.
This is the expected code behavior and has worked as such for more than a decade. Another new player pointed out this oddness so we might want to think of options for this.
But for now, what you described is expected.
- any piles in your held inventory combines
- to create separate stacks you can do something like "put 200 coins pack" twice to have two piles of 200.
For funsies note there is also a "count" command to help with counting coins.
Lastly, you might want to tinker with coin pile size. Examples, 699 might weigh less than 700 coins. Therefore not all piles might be equal weight.