I have Lightroom v6.8 and I have been culling my keyword list when I came across a problem.
If I scroll down to a word, and click to select it or double click to edit it, the focus leaps back to the keyword box of the last selected picture. i have to scroll down again and then click a second time before it selects the word.
Also I scrolled down to get a particular word and it will not scroll past the S entries. Stony is the last word I can get on my list so things like watre, where I misspelled water, I can't get to in order to delete.
Does anyone know what's going on?
Sounds like you are on Windows and have more than about 1500 keywords organized in a flat list. This basic bug has been outstanding for more than six years and Adobe declines to fix it. The workaround is to introduce a hierarchy in your keywords and expand only part of the hierarchy at a time.
Please add your me-too vote and details of your situation to this bug report in the official Adobe feedback forum: Lightroom: Chokes on large keyword lists (Windows only) | Photoshop Family Customer Community