When you submit a GEDCOM file for publication on Genealogy Online, it is checked using the GED-inline (*) service. This validation does not look at the information you entered, but at the structure and character encoding of the GEDCOM file containing your genealogical information. It answers the question: does the GEDCOM file comply with the GEDCOM specification? The more warnings, the greater the chance of losing information when you try to import the GEDCOM file into another family tree program or service.
When data is transferred from one program or service to another, this can only be successful if both parties assign the same meaning to the data. For genealogical data, the format (the structure and character encoding) is prescribed by the GEDCOM specification. This specification, which is crucial for developers of family tree programs and services, must ensure that the meaning of your genealogical data is clear.
If the GED inline checker displays warnings, this indicates that the GEDCOM file produced by your family tree program or service doesn't fully comply with GEDCOM standards. This doesn't mean you've done anything wrong! However, there's a risk that the data you entered won't be correct and complete if you transfer it from your family tree program or service via a GEDCOM file to another family tree program or service (such as Genealogy Online).
We recommend contacting the developer of your family tree program or service and requesting that they improve the handling of your data by adopting the latest GEDCOM specification. This will allow other family tree programs and services to process your genealogical data correctly and completely. GEDCOM version 5.5 dates back to 1995, and version 5.5.1 to 1999. The current version, community-approved GEDCOM 7, published in 2021, is therefore preferred.
You can download the complete GED inline report and send it to the developer of your family tree program or service. You can refer to this page, https://ged-inline.org/ , and https://github.com/nigel-parker/gedinline, which developers can use to check GEDCOM files for compliance with the current GEDCOM specification.
(*) The check is performed on Genealogy Online's server, so your GEDCOM file is not shared with third parties. You can also perform a check on your GEDCOM file yourself via GED-inline .