I wash my face with caffeine shampoo

Hey so I'm sure plenty of you got annoyed just by reading the title but hear me out.

I'm a guy in mid 20s, normal skin type. I've tried plenty of different facewashes, from cheap to quite expensive. Drugstore, high-end, Korean stuff, some with salmon cum, salicylic acid, retinol, lactic acid, devil's nutsack, whatever.

Tried different routines, like washing my face twice a day, once day, exfoliating, serums..

All kf these just irritated my skin, gave me acne, made my skin feel oily, dry and overall kinda scoffed.

The only thing that makes my skin glow like an angel is this cheap Alpecin caffeine shampoo. I just wash my entire head with it, I remember that I bought it for the first time because it smelled really nice and it had this tingling sensation to it.

So I've been using it like that for like 5 months now and it's perfect. I just apply a small amount and clean my face after I wash my hair.

Does anyone know why this is? Since I'm aware that it's not generally recommended and I'd guess you guys would know