I assume that you can reproduce this on your local environment; in that case please install that package via the package manager and check its log for the page you are interested. It should indicate the action (added/updated/none/...). Then double check the filter section (either in the filter.xml or via the package manager UI).
When I had this problem, it was typically a typo in the filter.xml (incorrect path or something like that).
I have seen one more problem with the version in the package manager where it says "A different version seems to be installed". Uninstalling the package and then deploy the code bring my latest changes to AEM.