Let us quickly clarify the force override feature. When the force override feature is enabled, this will allow the admin to disable the store status or enable the store status outside the preset schedule.
If the ability to disable the force override feature is not working, sounds like you might have a cache issue or a plugin conflict occurring.
For Cache clearing, did you enable the the cache clearing setting under the General tab? If no, please enable that setting. If the behavior continues, please consider disabling any cache plugins or services and test the functionality. We also support a cache clearing hook allowing you to clear cache, you can refer to support post: https://www.ads-software.com/support/topic/activating-caching-plugin-breaks-page/ and https://www.ads-software.com/support/topic/cache-clean-up-action-hook/
If the behavior continues, please perform plugin conflict testing and feel free to open up a support post for additional support on the forum: https://www.ads-software.com/support/plugin/order-hours-scheduler-for-woocommerce/