You're probably a "lean mass hyper-responders", a phenotype which is actively investigated, initial paper:

Elevated LDL-cholesterol levels among lean mass hyper-responders on low-carbohydrate ketogenic diets deserve urgent clinical attention and further research

https://pubmed.ncbi.nlm.nih.gov/36351849/

A few other more recent papers:

https://pubmed.ncbi.nlm.nih.gov/35498420/

https://www.jacc.org/doi/10.1016/j.jacadv.2024.101109

Note: I'm not a doctor.