LordFlashHeart

Thank you. That's what I'd like the staff to answer, so we know 100%
Is it bugged? It is just designed nonsensically and poorly worded?
If that's the case then it seems like a bit of a waste of a reset button. It would make a lot more sense to be able to reset the brush after you've had a chance to use it and see how it behaves. Having to save duplicates every time you might want to restore something seems like a huge oversight.
 
Based on the 'Additional settings' text, I don't think it's working as intended or described.
Additional settings:
Reset—returns all stroke settings to those of the saved brush preset. Duplicate—saves the current stroke settings to a new preset. Close—exits the dialog and applies stroke settings to the selected preset. To me, a 'saved preset' is a group of settings that you can easily return to with one click, whenever you want. It's sole purpose is to make it easy to return to that state and to always be available for efficiency. You wouldn't normally lose a 'saved preset' unless you intentionally force a save over it. If it automatically overwrites your preset every time you change something then it's not much of a 'saved' preset.
'Reset' should return you to your saved preset. That makes perfect sense if 'Close' didn't automatically save over your preset.
'Close' doesn't specify that it saves over your preset permanently, it's not logical* that it would save over your 'preset' because 'duplicate' is for creating custom presets.
*it makes sense for the duration of that session/project but not permanently.
'Duplicate' exists as an option so that we can save alternative defaults/presets for a brush. It doesn't make sense that if you don't choose 'duplicate' before you click 'close' (to test your new settings on paper), then it automatically overwrites your current saved preset.
None of these options are working logically unless I'm over-looking an option where I can restore a brush to it's true defaults.
 

@walt.farrell
Looks like they know that it's not working and are in no rush to fix it (May 2018).
 

The staff are around, and may post here at some point, but often if the users have given the right answers they'll spend their time working on things that haven't been solved yet. I doubt they'll be able to offer any additional suggestions to you to fix your current problem, but if they do they'll probably post.
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No, it's not a bug, as far as I am aware. The Reset button in the brush editing dialog is intended to remove any changes you've made during that use of the edit dialog, and restore the brush to what it was immediately before you started changing it.  If you make changes and Close the dialog, then that's the new status of the brush. If you edit it again, Reset won't get you back to the original content, and is not supposed to. That's based on prior discussions in the forum, with staff involved, and on the Help which says:
 
Note that it does not say "the original settings", but the "saved brush preset", which is the last values you saved if you've done any edits.
You could post a Feature Request to provide a true "reset to original settings" for a brush, or search the Feature Requests to see if there's an existing request you could concur with. It would be a useful function to have.

I said in the first post that 'delete and reinstall' is not a solution to this problem.
 
At this point it's the only approach, that's why I made the post.
Yes obviously it would have been better to duplicate the brushes so that I could play with the modifications but, seeing as Affinity didn't flash up a warning in advance telling me "the reset feature doesn't work", I wasn't aware that I wouldn't be able to reset them so I didn't duplicate them.
 
That's exactly the same as deleting and reinstalling or creating a duplicate.
 
 
Are there any staff in here that can actually help with this? Is this 'failure to reset to default' a bug or am I missing something?