There are outdated LOD models in the load order or full models have been replaced without providing updated LOD models.
Install the latest DynDOLOD Resources.
Check if 3rd party LOD models for mods have versions specifically for DynDOLOD 3 and install them instead of older versions. They should typically overwrite DynDOLOD Resources.
Check the mod LOD Model Library for DynDOLOD in case a mod does not have LOD models for DynDOLOD 3 itself.
Outdated or not properly made LOD models might still work fine in many cases, however if they replace newer versions included in DynDOLOD Resources or in 3rd party LOD models specifically made for DynDOLOD 3, it is possible for object LOD not to match anymore if there are base records using replaced texture sets.
Consider changing the overwrite order for the mentioned LOD models so that DynDOLOD Resources is the last to overwrite them.
If and only if there are obvious differences of the textures between full models and LOD models, the log messages can aid in quickly finding the reason. A fix would be to create a copy of the LOD model, amend the LOD filename with the CRC32 of the full model and to update the textures paths. See How to add your own LOD models. If there are no obvious differences of the textures between full models and LOD models, then nothing else needs to be done.
If this is reported for LOD models included in latest version of DynDOLOD Resources and because the full model has been replaced by a mod, check the log for messages about LOD textures being created on-demand for the reported full texture or if the texture was part of the TexGen generation. Check if the LOD representation for the full model has matching textures to the full model in the game. In case there are visual discrepancies, make a post on the official DynDOLOD support forum to request updated LOD models for the mod. In addition to the usual logs, provide the name and link of the mod and install options if applicable.