Hello Austin,
Is it possible to share the sample project demonstrating the problem (two models textured with GPU enabled and disabled) and also the source images that we can use to reproduce and analyze the problem on our side?
Please send the download link to the data to support@agisoft.com. Also specify the OS version used, NVIDIA driver installed and, if available, share the logs corresponding to GPU-enabled and CPU-only texture blending operations of the same model.
Meanwhile you can create BuildTexture/enable_gpu tweak and set its value to False, if you would like to disable the use of GPU for the texture blending.