Duplicate Finder - Not finding Duplicates

Sorry if this has been posted in the wrong area. I've found a lot of duplicates and removed them using CCleaner for Windows on a Laptop. Nothing else was getting returned as a duplicate so I thought they'd all been dealt with but I've found some myself manually. I've checked and:

-The filename matches

-The filetype matches

-The files are both within the folder structure I'm searching.

-They're slightly different sizes but all I'm searching by is filename.

Does anyone know why it wouldn't find these duplicate files?

It is hard to see how you can class them as duplicates when they are different sizes :)

A duplicate is an exact copy of something else.

12 hours ago, Nick3475 said:
<div class="ipsQuote_contents ipsClearfix" data-gramm="false">
	<p>
		....... all I'm searching by is filename.
	</p>

	<p>
		Does anyone know why it wouldn't find these duplicate files?
	</p>
</div>

Look at the ignores, particularly file size over/under.

Check the wildcards in the search strings in Include.

Check if you have any Excludes set.

If you post a screenshot of your finder settings then we may be able to spot anything that could be an issue.

Can you give the FULL pathname/filename.extension for 2 that you think are duplicates but that aren't being found.

8 hours ago, hazelnut said:
<div class="ipsQuote_contents">
	<p>
		It is hard to see how you can class them as duplicates when they are different sizes <img alt=":)" data-emoticon="" height="20" src="<fileStore.core_Emoticons>/emoticons/default_smile.png" srcset="<fileStore.core_Emoticons>/emoticons/smile@2x.png 2x" title=":)" width="20" /></p>

	<p>
		A duplicate is an exact copy of something else.
	</p>
</div>

The filenames are duplicates. ?

3 hours ago, nukecad said:
<div class="ipsQuote_contents">
	<p>
		Look at the ignores, particularly file size over/under.
	</p>

	<p>
		Check the wildcards in the search strings in Include.
	</p>

	<p>
		Check if you have any Excludes set.
	</p>

	<p>
		If you post a screenshot of your finder settings then we may be able to spot anything that could be an issue.
	</p>

	<p>
		Can you give the FULL pathname/filename.extension for 2 that you think are duplicates but that aren't being found.
	</p>
</div>

It was the Excludes. I excluded some filepaths in a previous search (whilst actually selecting files to delete) and didn't realise they stayed as an "Exclude" for subsequent searches. I thought I'd have to set them PRIOR to running the search to make them stay for subsequent searches but hey ho. Thanks for responding!

I know just what you mean; when I was checking mine I had 3 paths excluded and have no recollection of just when or why I set them.

They are not places I'd usually be looking at for duplicates anyway, (one of them contains the manual/files for this laptop), so however long they had been set there it hadn't affected any recent searches.