redfield
As suggested above, report these events to you station manager who should take the matter up with the airline's ops manager directly. It is important that you do so. At some point in the future these errors may be picked up in your usual QA audits so it is important that if an error has been made it is reported now and not found later.
Further, can I suggest you read the CAA Safety Reg Group FODCOM (see their website) regarding loading errors, in particular 06/2002 which highlight responsibilites and the reconciliation of loading.
http://www.caa.co.uk/docs/33/FOD200206.pdf