Thats because there is a difference.
First you need to figure out if you mean bloat as in water weight or bloat as in fat storage.
Dbol is not slin. Dbol is a different hormone that causes water bloat due to slight effect on aromatase activity and also it causes you to hold water.
So dbol bloat is water weight.
Slin bloat, if you allow it is fat/glycogen storage and water weight.
Slin is more likely to cause bloat from not just holding water.... but everything if you eat shitty while running it.
Slin is mainly used to shove nutrients, (protein and carbs) into muscle cells. Now 1 gram of carbs can hold 3 grams of water. So if youre using doses of slin that your body normally wouldnt produce and you add in amounts of carbs that your body wouldnt need in order to control the slin dose... then you equal a shit load of carbs and water being shoved into your muscles. What doesnt go to your muscles goes to your organs and other storage areas. So you look bloated.
I personally have ran slin both IM and Sub Q without any bloat.
One, because Im lean pretty much all the time.
Two, because I make the slin match my diet, I dont change or up my carbs to meet my slin dose.