it's the way your muscles are working.
Firstly, there is sarcoplasmic hypertrophy. this is aesthetic. this is bodybuilding. this is when water is forced to your muscles to create a bigger fuller muscle.
Then there is myofibrillar hypertrophy. this is strength. this is powerlifting. this is when your muscles actually increases in thickness, and you get stronger.
When you powerlift you will employ mostly myofibrillar hypertrophy. body building is mainly aesthetic.
The way i did it was at first quite random, I had no idea what i was doing, after researching i found a program that consisted of 4 phases. 1st phase is foundation, supersets high reps, builds muscular endurance. 2nd phase is strengthening, heavy deep lifts with a pyramid structure, 3rd phase is to build with a hybrid approach high rep/lower weight AND low rep/heavy ass weight. 4th phase is the detail phase where you go high volume/high weight (utilizing the strength you just built up), but you cut your caloric intake as well to reveal your cuts and striations.
After this i will take a week off and just maintain, while i research my next program which will likely be oly lifts or powerlifting.
You need a foundation first, once you have that you can play with whatever works best for your body.