Issue on brush, looks pixelated (photoshop 2021)

[Camille5C73]

Hello,

I'm kind of new on using photoshop, I was drawing with some brush and suddenly had an issue with my brush, to explain this, here is a picture:

On the left this is what I've got previously and on the right the issue I'm having. 

I think I might typed a shortcut accidently but I looked on the internet for it and couldn't find it....
The mode is on normal and the brush tool is correctly selected...

[JJMack · Accepted solution]

What  your document size and resolution , what brush type and what settings, tip, spacing, scatter, blending, opacity, etc? How are you viewing the stroke zoom level etc. You are zoomed is so much the pixels grid would be showing you can see the anti-aliasing being done as well as the scattering or brush tip pixels and shading. 

[Semaphoric · Accepted solution]

I would first check to see what the Blending Mode is for your brush. It looks like it is set to Hard Mix; be sure it is set to Normal.

[Bojan Živković · Accepted solution]

Can you post some screenshot if above answers does not help? Include Tools, Layers panel with layer on which you are painting selected and the Options bar. It may be even blend mode set to Layer (Dissolve ---> Alt + Shift + I), not to Brush.

[Camille5C73]

Thank you all for your answers, I just noticed in fact that the brush was acting like that in only one layer and I must have accidently changed this parameter from "normal" to "fondu" (sorry I'm french I'm not sure of the name of this section in english) but I think it's what you said all.

I'm sorry to have bothered you all and thank you for your help! 
I can peacefully return to my drawings. Have a good day all!

[Cate35656707ry53]

Hi, I was just having the same problem as you! As it turns out, my Blend Mode was set to Dissolve and not Normal.