Or it’s possible your skin is just different… bodies are all different in so many ways, it can have a big impact on outcome. That said, the bevel up (point down) method carries a possibility of skin scooping into the needle as you go in, and flipping back like a tiny flap. That means there is a bigger chance of the needle encountering some resistance at that point, which requires more force to overcome, which means the point of the needle is going to stab inward once the needle is pushed past this resistance. That could create some additional tearing of tissue or result in a slightly different outcome.
On removal of the needle, that flap may flip back and aside from a slightly more difficult insertion, there won’t be much difference after. However, if it does not, and it remains folded up under your dermis, then healing will involve a “bump” at the incision site and possibly a more visible scar and a longer time to sort itself out aesthetically speaking.
Ultimately though, if you have good control over the skin for the entire length of the needle’s path, then bevel down usually results in best results.