Strange character appearing in older posts

I don’t know where to begin to place this request for help.

I have a symbol that is showing up in my posts. It is: ? usually at the end of sentences and in older posts, not the newer ones.

I can remove them manually but there are a lot of them.

Upon further investigation I did a search for that symbol in my database and it’s is showing up everywhere. I am treading into dangerous territory if I mess with that stuff.

Here is a short example of what it looks like: (Is it a common symbol for coding?)

Example:

SELECT *
FROM beadner_wrdp1.wp_options
WHERE option_id LIKE ‘%?%’
OR blog_id LIKE ‘%?%’
OR option_name LIKE CONVERT( _utf8 ‘%?%’
USING latin1 )
COLLATE latin1_swedish_ci
OR option_can_override LIKE CONVERT( _utf8 ‘%?%’

And here is an example of a post that shows the symbol within:

https://beadnerd.com/?p=173