This has been happening for about a month. The app doesn't show the option for 'Attended' at events. I thought it might have been a time issue as I'm in Australia but no....it just never appears as an option. The first attached screenshot doesn't show a 'Will Attend' option because I actually did a will attend so it disappeared. It only seems to affect the 'Attended' option. I always keep the app updated to the latest releases. I use an iphone XR. I recently had to delete and reinstall the app to fix another issue but it hasn't resolved this.
The second screenshot is from my old iphone 6 (which my partner now uses). As you can see it also doesn't show the 'Attended' option and he hasn't updated the app to the latest release as yet.
Any hints?
I had this issue last weekend. I use an iphone xr. In the end, I deleted the app and reinstalled it....now works fine. I always keep app updated with latest releases. I wasn't using filters at the time.