i used to have this happen to me sometimes after banishes. it would either give me double coins or show me something like 2B credits for example. it went away over time and tyhe best you can do is is simply refresh. don't forget what they say: "if it sounds too good to be true..." and if you have all of a sudden 2B coins more than you had before then wishful thinking wont make it come true. its rather inconvenient or annoying. so whenever you think you have too many coins or creds, simply refresh (force syncing) and you will see the actual amount you really have.
EDIT: i would like to emphasize that this is not a rune problem, but a syncing problem