Home screen widgets don't stay connected all the time. The system decides when they update, based on things like battery level and how often you use the app. So a home screen widget showing slightly older data than the app is normal.
Try these in order:
On Free, up to 2 home screen widgets keep updating. Any more show "Free includes 2 home screen widgets". See "Free and Pro".
iOS allocates updates based on how often you use an app, so opening the app regularly helps its widgets stay up to date.
Service widgets on HarmonyOS update differently. See "HarmonyOS: when service widgets update".
If you've tried all of the above and the widget still hasn't updated for a long time, send us a screenshot from Me › Feedback.