Everyone seems to be having similar issues, with good reviews collected by real customers not being accepted or posted by Google. We've reach out to Google for more information of why this is happening and what can be done if anything to correct. Below is response from Google on Google+ local business page ratings;
I submitted your question to our Review Team to ask why some of the reviews have been removed from your GMB page. What I was told is that the reviews left are managed automatically by an algorithm (computer program). We do not have people arbitrarily removing or filtering out reviews. The reviews that you have reported were either removed or filtered by the algorithm.
Reviews can be filtered by the algorithm for many different reasons which we are not privy to as it is proprietary information that is not shared (even with myself). I do know that some of the reasons
- the algorithm may have suspected the account was bogus
- the IP address may have been identified or associated with the business or a competitor
- the person who wrote it may have deleted it.
- the account from which the review was written was deleted
There are many other factors that are used to determine the validity of a review. We really can not determine the actual reason in any specific case because, as I mentioned, it is an automated process. Occasionally reviews can get filtered out erroneously. Normally when this happens the reviews return later, but there is no guarantee any review will ever display. Our system is not perfect and our engineers are always searching for ways to improve the process.
The best advice I can give is to continue to encourage new customers to post reviews and to let others know about your business.
I hope this information is helpful. Have a great day!