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80% of Browser Type 'Other'

Gradually over the last month of IIS logs were getting increasing percentage of users with Browser : 'other' and OS 'other'
Looking at the IIS logs there a number of GET requests without a browser defined - instead there is a dash '-' for example:

GET /pages/VSearch.aspx - 443 - 222.333.444.444 HTTP/1.1 - ASP.NET_SessionId=f443434bs155erk0op55 - 200 0 0 21282 183 998

IIS 7 server 2008R2....

When I navigate to the site in IE11/Chrome/Firefox I can see it recognises my browser verison - any ideas what could be causing this?
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