How Come Meta is different based on different query?

[RobertFisher]

We have a site we added a number to in the meta description. Once we did that we did a fetch as google to hopefully recrawl the page quicker. A few days later and we cleared W3 cache on WP and clear computer cache, then did search on common search for the site/page. WidgetA for example. The url is OurClient.com/widgetA/ - on organic in meta on SERP and we see our new meta with number.

We then do a search on a similar term WidgetingA for example and the same url shows:

OurClient.com/widgetA/ BUT THE meta description is different on SERP! It is the old meta. When we look at the element using mozbar, it shows the new meta as it should same as when we look at it under the original search term.

So, search for WidgetA, get new meta in serps and search for WidgetingA (which returns same url as WidgetA) and we get the old meta.

Thoughts???

[RobertFisher]

Actually, both are reasonable in my opinion EGOL. I was stuck because my local person had put the numbers in and she kept saying they are not showing and I kept saying they are. 
Here is the only other variable I failed to mention: there is a PPC ad on the query with the old meta term.

Thanks,

[EGOL]

I am willing to bet that old data is being served for WidgetingA.  I believe that updates to the SERPs do not occur for all keywords at same time.

It could also be a sever on the tail end of a database update - since Google has thousands of severs responding to queries and updates to the databases do not propagate  instantaneously.

Those are at least two explanations.  There are probably more.