It is not strange at all thats why everyone says less is more with sub's.
The reason you feel "high" from low dose's is because you aren't flooding your opiate receptor with bupe you are just partially filling them leaving some open and when bupe is metabolized it turns into norbuperenorphine which is a full agonist just like morphine and oxy and then that binds to your open receptor's causing you to feel the full agonist effects. That's why you wanna be on the lowest dose possible because it actually works better at low dose's as far as how it makes you feel
The reason you feel "high" from low dose's is because you aren't flooding your opiate receptor with bupe you are just partially filling them leaving some open and when bupe is metabolized it turns into norbuperenorphine which is a full agonist just like morphine and oxy and then that binds to your open receptor's causing you to feel the full agonist effects. That's why you wanna be on the lowest dose possible because it actually works better at low dose's as far as how it makes you feel