Each person has a neurological profile. Dopamine-dominant, Acetylcholine-dominant, Gaba-dominant, Serotonine-dominant or a balanced type.
That neurological profile plays a huge role in how much high intensity work you can tolerate. For example someone who is dopamine-dominant (extroverted, risk-taker, center of attention, high energy, etc.) can tolerate A LOT of volume and frequency of high intensity work.
Other profiles are much more at risk of neural overtraining from high intensity work. For example Acetylcholine-dominant people need to deload after 2 weeks of heavy weights training. So each 3rd week will need to have 40-50% less volume. Serrotonine-dominant people can’t tolerate high intensity work at all and if they are to do it, it needs to be in very small dose.
Is there something wrong with you? Maybe, maybe not. It could also be an hormonal issue. But your symptoms seem neurological to me so maybe you just don’t have the neurological profile to be able to handle a lot of high intensity work.
I suggest taking the Braverman assessment (can be found on the internet) to see what is your neurological dominance.