@AddictedtoCrunchies Has the £5.93 original payment come out? Is that somewhere in the account screen? I would look for this.
Or is it a partial refund e.g. transaction was for £30 and £5.93 of that £30 will be refunded?
However I do think what you're seeing here is a side effect of having your categories grouped by bank account - this does confuse things slightly.
Usually when you get a refund, the refund will come back into the category.
So for example if it was an amazon purchase of household items, you'd have this scenario.
Account balance: £45
Category "household" balance £30
Make purchase of £30 at amazon, category "household".
Account balance is now £15, household category balance £0
Refund gets applied - this shows up as a transaction for "inflow" £5.63 - payee amazon, category "household".
(NB, if you have had another transaction in the meantime at amazon perhaps for "books" - it will automatically categorise this one as "books" too and you'll need to change manually).
Account balance should now be £20.63, Household category balance should be £5.63 - which you can move to another category if needed.
If this hasn't happened, maybe it helps to identify where in the process it went wrong?