We have noticed an issue which can be easily reproduced on your demo page.
Expected result: Cars category is unchecked only
Actual result: Both Cars and Bikes categories are unchecked.
The issue can be reproduced both for 2.2 and 2.3 html5 versions. We are currently using 2.2 version but planning to move to 2.3. So it would be great if you could release a fix for both versions. Note, it used to work fine with flash version.
Thank you for your question. The filtering behaviour you have described is not a bug but a product of our design. This feature can be implemented in different ways with different expected results, the approach you are observing now is the one our dev team have settled on. Speaking about you case, the result you are expecting could be reached with one more additional step. Here is an example https://www.screencast.com/t/m2RrS9Cm5i .