All master (new) records created in the DynDOLOD plugins have a unique Editor ID.
When updating existing DynDOLOD plugins these Editor IDs are used to identify records, their type and function.
The error can be caused by a DynDOLOD plugin from an incomplete generation that stopped prematurely or had other errors.
This can happen if the load order changed and master records from other plugins that were forwarded into the DynDOLOD plugins do not exist anymore. The overwritten record in the DynDOLOD plugins becomes orphaned and is instead injected into the master plugin. The first two digits of the Form ID point to the original plugin the now missing record was from.
Updating the existing plugin will not work. Generate a new LOD patch for the current load order from scratch.
If the existing DynDOLOD output was generated without error and none of the plugins in the load order changed, this can be a hint of something going wrong. Report the issue on the official DynDOLOD support forum.