We are using google custom search and we have found that often the totalResults iterates between two values, even for the same query. The different values can be slightly different or more than double.

The parameters I am using look like this:

https://www.googleapis.com/customsearch/v1?
q=something
cx=XXXXXXXXXX
lr=lang_en
siteSearch=www.mydomain.com
start=1
fields=context%2Citems%28fileFormat%2CformattedUrl%2Clink%2Cpagemap%2Csnippet%2Ctitle%29%2Cqueries%2CsearchInformation%28searchTime%2CtotalResults%29%2Cspelling%2FcorrectedQuery
key=YYYYYYYYYYYYYYY
filter=0

This is problem because of calculating the number of result pages. How can I get the same results for the same query?