Are you not able to see the 'Rent'/'Buy' button for your bundle?
"Rent"/"Buy" button can disappear for bundles if there is an expired film or TV season in the bundle. Since the platform restricts users from purchasing expired films the whole bundle gets blocked.
Note: A film or TV season expires when the film reaches its until date.
Withdraw the bundle
Remove the expired film or TV season from the bundle
Publish the bundle
Note: Sometimes the changes will show up immediately on the frontend. If it doesn't, please give at least 5mins for the changes to appear.