I have several keywords, and it seems to grow slowly with time, that show a large negative number. For example, -9998. It seems from what I can tell that the ACTUAL rank is 1000 + (the number). Eg 1000 + -9998 is 2. That keyword is in fact ranked at 2. I have -9995, -9991, etc, the rule above seems, anecdotally, to apply in many cases. Thoughts?
Sorry, yes, wasn't clear. It is in a change column. But it doesn't make sense to me. The rankings were fine & stable on a manual check. So why the odd numbers?
Google may be throttling your API usage (there have been reports of that happening lately). See this post.