Why doesn't my acid reflux go up my esophagus (I have heartburn only in a very particular region)

I've had this for years, I hear everyone that has heartburn has acid go up their esophagus as far up as their throat. I've had heartburn for like 9 years but it never once has gone up my esophagus. I basically only have heartburn below my breast bone, around the LES region I suppose

I also have swallowing pain, that affects that exact same region I'm talking about. My swallowing pain is kinda similar to the heartburn pain I get after meals. I've tried spasm meds and they do nothing, PPI's definitely help, but I'm just confused as to why 99.9% of my symptoms are all in a very localized region of my esophagus. Anyone have any possible insight?

Thanks

I guess it might be the same dynamic has LPR. People with LPR only experience the burn, cough and globus effect in their throat and do not seem to experience any in the esophagus. Strange but we are all different.