Updating 1 of 8 observations : Android app

I have had my app reporing Synching 1 of 3 observations for a while. Today i have had an issue making new observations and now i have 8 observations that appear to fail the synch.

Any advice on clearing down these failed observations.

Additional note. I uninstalled the app then reinstalled. It then listed the problem observations which i was able to delete. Not elegant but it worked.

Additional note. App repeatedly fails to upload the same images. Im going to have to uninstall again.