Hi brazzenfnq
As advised by Isaiah_C this issue is usually caused by incorrect linked accounts. If unsure how these should be set, open the sample Clearwater file, even if it is an old expired file, this will show you how these should be set.
Thought I would mention the following - if you intend to make corrective changes via a general journal, go ahead and make the linked account changes for each affected item taking note of what you are changing - screenshots of the Item Profile screen are best. These will help you work out what account transaction changes are required.
If however you intend to delete or reverse the incorrectly posted transactions, I would recommend a 2 stage approach. First identify the changes required, however do not make any changes. Reverse or delete the incorrect transactions BEFORE you make any changes to the Item settings. Next make the required changes, then re-enter the transactions. This is the best way to ensure MYOB deletes or reverse the original transactions correctly.
Regards
Gavin