The earlier logged ticket PDFNET-44492 has been resolved and now API generates PDF/A file with correct version. The fix to this issue has been included in Aspose.PDF for .NET 18.5 and we request you to download and use latest version, in order to resolve the issue.
Furthermore, as shared earlier, we have found that the generated PDF/A document had issues for compliance validation and we have been working over resolving them under the ticket ID PDFNET-44577. As soon as we resolve this issue, we will surely notify you within this forum thread. Please spare us little time.
We are sorry for the inconvenience.