Maybe you only have it updated in the iPhone and not in the watch. Try to update it in the App Store in the watch itself. Sometimes the versions are not in sync (for me it is an obvious bug in apple implementation)
It is really annoying. It happens every time I release and I still don't understand why Apple don't update the watch app when the iPhone app is updated. I asked about it a few years ago on their forums and they said that it is because the watch app is able to run independently without requiring the iPhone app.
For some reason they think that means that users will not want the watch app to be updated when they update the iPhone app. However in my experience 99% of users probably expect the watch app to be updated when the iPhone app is updated. I read post by a WOD user on social media yesterday who saw a warning about needing to update the WOD watch app, and then realised that 4 more of his watch apps were also out-of-date.
At the very least I think it should be optional, or the user should be asked "Do you want to update the watch app as well?". The strange thing is that often the watch app does get updated, but maybe that is when both apps are updated automatically.
What makes it even worse is that I can't change the app back to not be independent because Apple do not allow that. It is a one-way change. I made the app independent thinking that it will help the small minority of WOD users who do not use the iPhone app, but I actually caused issues for the vast majority that do use the iPhone app.
I try to mitigate the problem with each release. For example the apps now look at each other's version numbers when they communicate, and will warn the user when they don't match. However this only happens when they need to communicate, so I plan to improve it so that the watch app will always try to communicate with the iPhone app when it starts up, to determine if that is more up to date.
I don't like working around what I think is a bug, but it doesn't look like Apple have any plans to fix it because they do not consider it a bug.
Another problem is that the TestFlight system used for beta testing always updates the watch app. This is a good thing generally (I wish the App Store did the same), but it means that any workarounds I add are never beta tested.
Apologies for the very long rant!