Thanks for the response Spikey. Oops, forgot to include the texture files! I’ll be sure to update that. Thanks for pointing out the normal output, it is now directly linked from normal to normal. I also tried it with 1px, and the problem actually got worse, image below:

Link with all files included this time:
https://drive.google.com/drive/folders/1D-w52F7CIlcxl29bvFOCG9JJSsq25cm8?usp=sharing