To everyone here, the quote system unless you are familiar with it, is generating lots of mishaps on this site.
1.
If you want to post a reply without a quote just click the larger 'Reply' button at the very base of the page (not a Reply button next to a post).
That's the 'Point A' simple approach and it keeps unnecessary long quotes out of the equation.
2.
If you do want to quote (don't click a Reply button! - yes this is radical), from an existing post select just the text you want to quote, a 'Quote' pop-up option will appear, click on it. You now have just that text in a new reply editor window (who posted it will be included).
3.
As a powerful optional extra, you can also scroll up behind your reply window and find another section of text to quote - maybe from another poster in the same thread. Do the same, select the text, the 'Quote' pop-up will appear again, click on it. That text will be added to your reply window. Between these multiple quotes you can enter your own text, photos etc.
The above is worth doing in a linear order to avoid mishaps, i.e. select > quote, then type your text, select > quote, then type your text etc ;-)
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NB in 2. the 'don't click a Reply button' is said mainly to learn the above 'select-text' method. If the other member's post is short and you want to reply to and quote it all, then yes click the Reply button next to it (it's doing the same as the above but is selecting all the text). If the post is long though, and you only need to refer to a small part of it, the above approach (selecting text) keeps the length of replies down, and more focused. Also the multi-quote method is essential to learn! Enjoy.