It’s the same for everyone. Being just short of an item is by design. The prices are put in a way where you can’t buy a pack of Silver that gives you exactly the cost of an item. This way, you always buy more, which means you always have some left over, thus you’ll always be just short of the next item. It encourages people to buy more Silver as otherwise they can’t use the small amount they have left. This is a big reason why so many game storefronts use a fictional middleman currency like Silver instead of the simple idea of just using plain money so that you have less control over how much you spend and how much you have left over.