Illustrator vector brush changes size depending on length

Hello, as per the above, the left brush stroke is longer and is subsequently much larger in width and general size. I'd like it to stay the same size regardless of length.
I've tried unchecking the 'scale strokes and effects' however it doesn't seem to do anything.
If you can provide the solution for an iPad that'd be great please however I'd also be interested for the solution on pc.
Thank you in advance.
