There is a well-forgotten field Correction in all Journals (underlying Tables, to be precise), by default not included in Page, so in can't be Shown/Hidden by user - the page must be modified by a developer. Purpose of this field is to post so-called STORNO transactions, that is, negative Db amount instead of Cr amount (and negative Cr instead of Db). Such postings adjust the balance, but do not increase turnover. You have somehow managed to tick this field in one of the Journal lines, but, if used, it must be ticked to YES in ALL one doc lines, in other words, all Lines must have NEGATIVE amounts. If the field is not visible, it nevertheless "ticks" automatically in background when a NEGATIVE amount is entered in either Db or Cr, that's another way how to achieve the behavior you have.
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