This MAY be your tool presets that are messing with you and not the brushes. I'll take a quick screenshot to give you an example, but basically you have to load in your tool presets separate from your brush presets, cuz if you don't, whatever your tool preset is will carry over no matter what brush you're using (I've both accidentally and on purpose done this and gotten some really neat effects). It can be a lil confusing because certain tools will automatically grab a brush as well, but if you go into your brushes the tool won't change, so it looks like to me this is what might be happening to you.
Here's the tool dropdown:
Here's the brush dropdown:
If I select Kyle's Oils I'll get something that looks like a dab of an actual paintbrush, but if I select those crunchy oblong shapes that are showing up in the brushes, the "oil" effect from the oil tool will carry over to that. But if I select a different tool, say "flat alternate" for example, a different effect will load on my brush.
HOPEFULLY this helps you. I don't know if this is for sure what's going on for you, but it's happened to me a few times and it did take me a bit to figure out what's happening.
