I am not 100% sure what causes this, but the following workaround may help:
Instead of using the cube hierarchy as a quick filter, the attributes can be used to filter instead.
An attribute will have an icon like this:
Where a hierarchy will have an icon like this:
So instead of using the Year hierarchy, you can use a Month attribute or Month Year attribute if they exist. If you do not see attributes for the Year hierarchy, the attributes can be created in the data base for each level of the hierarchy you'd like to use as a quick filter. Using attributes as quick filters should eliminate the issue with the hierarchy quick filter and will also make the filter(s) more user friendly.
Hope this helps!
Thanks very much for the reply. I do not have the attribute created for Month or year and would consider creating one for Month and year as suggested.