Lisa,
@ishareflowers I think it depends on how you enter the amount of seeds for each item. If I check an item for two different swaps and I have one pack of seeds available for each one, it will only show one pack of seeds even though I actually have two packs of seeds. Now if I were to put two packs of seeds available, then I'll be in trouble because I won't have any left for the second swap.
Another problem with having seeds available for two different swaps is once the first swap is over and it shows zero available for the next swap, I have to go back and recheck to see how many I have available for the next swap... double work!