BankStack

BankStack is the leading cause of things moving in your bags and bank.

It:

sorts your inventory, bank, or guild bank
fills incomplete stacks in your bank with items from your inventory
compresses your bags by filling incomplete stacks within them
puts a chicken in every pot, and pot in every chicken
Quick command reference:

/bankstack : show configuration
/sort : rearrange your bags
/sort bank : rearrange your bank
/stack : fills stacks in your bank from your bags
/stack bank bags : fills stacks in your bags from your bank
/stack {group1} {group2} : fills stacks in group2 from group1
/compress : merges stacks in your bags
/compress bank : merges stacks in your bank
/compress {group} : merges stacks in group
/fill : fill empty slots in your bank from your bags
/fill {group1} {group2} : fill empty slots in group2 from group1