If your design goes over the edge of the design... ie Is larger than the display.
When you try to change the card settings, the pieces that are bigger than the display, can cover parts of the settings.
Customize Watch>Card Settings
This is just a layering issue.
(How to fix this issue)
The Watch Desgin layer should be beneath the Options layer
Then any pieces that go over the edge of the design will still show, but will be under the options, so you will still be able to see the options