Event Properties not appearing in Dashboard

When sending an event through the Javascript SDK in an application I am using I pass event properties into the sendEvent method. I can see the desired object on the request to Amplitude when it sends the event and the object it attached to the event_properties field on the request payload. However, the event properties are not appearing in the UI and I don’t know why. I saw them for a few events then they stopped all together. I haven’t changed the code regarding sending the event at all so I don’t know what’s happening. Any ideas? Thanks!