I'm a total newb to Blender, so I don't know if this is a simple problem, but I'm following a tutorial and am currently learning how to use the sculpt tools. However, while the tutorial is showing very smooth and predictable results, my brushes aren't reacting the same way. I've tried several brushes, and most of them are producing a similar result. The flatten brush is only flattening along the sides, but it's not making a stroke like it seems like it's supposed to. All the other brushes are malfunctioning as well. Sculpt/draw, crease, and Nudge make similar strokes, nothing at all like their example images, and nothing at all like I've seen they're supposed to.
I have smoothening on, dyntopo is on, all of my modifiers are applied, so there are no actives ones. I tried applying the scale of my object, and the scale, but none of those solutions have solved the problem. I've searched in all of the forums I could find and still haven't found anything. Any help would be greatly appreciated!
The tutorial I'm following: