Just noticed that google completely screws up our meta titles in the SERPs. Google decided to show titles which are not understandable to visitors and worst of all even shows titles in different languages than the actual page. The words of the displayedf titles are nowhere on the page (actually they are parts of old title tags that we stopped using 6 months ago and that we used on different pages). Pages are crawled weekly.
All our meta titles are a bit longer than the 70 character limit, so I plan to rephrase and shorten them so that they are all max. 66 characters. Dynamically we choose different variations of title texts based on character length of keywords.
Having titles that fit into SERPs without cutting are supposed to have less probability to be changed by google.
I heard some people reporting loss of rankings after site-wide meta title changes. Especially since we changed title tags sitewide already about 6 months ago I am a bit concerned.
How would you proceed? Just do the site-wide change all at once?