I’ve noticed quite a few times (and it also happens to me) that when a poster is quoting part of an earlier post in a topic, some of the first characters are often missed. In the past, I usually notice it before posting (or immediately after) and make a correction but it can be annoying if your mouse control skills are suspect or the mouse skids over the surface uncontrollably.
It hadn’t occurred to me that there was a fix until I read this article which explains a better way…
Instead of a single click and drag, try doing a double-click instead. This will highlight word by word rather than letter by letter, which is much more efficient.
It takes a little practice initially but once you have mastered it, it works every time.
Try it out… double click with the left mouse button anywhere on the the first word you want to select, don’t release the mouse button but just move the mouse in the direction required until all the text you wish to quote is highlighted.
Devilishly simple… I really don’t know why it took me so long to realise it!