Dashboard missing data range

I have a Looker dashboard that functioned correctly for a week. Now, without any modifications, it's exhibiting data range issues. Specifically:

Charts filtered by 'Today' as the default initially display no data. I must manually re-select 'Today' in the date range filter for them to populate.
Similarly, charts displaying the entire data range also show no data initially. Again, manually re-selecting the date range corrects the issue.
However, this fix is temporary. Upon refreshing the page, the dashboard reverts to displaying no data until the date range is manually re-selected.
Essentially, the dashboard seems to lose its selected date range upon loading or refreshing.