I use the search volume found in keyword planner to score and weight my keywords in a similar way as Rand showed us in this WBF. This week I've found that in many cases suddenly the singular and plural version of the keyword have the same search volume. This seems crazy to me as singular and plural is not the same, the intent is different but more importantly they behave very differently from each other when looking at their track record in Adwords (impressions, clicks, conversions, CTR, CVR etc...all different). For example, here's a screenshot of 4 keywords (singular and plural versions of 2 phrases) with search volume captured a couple of months ago. Now here's another screenshot of the same keywords taken from Keyword planner today. Any ideas why this would be happening? Does it makes sense to you? It just seems buggy to me. Thanks!