So, this is a roundabout solution, but it worked for me. I had three stocks with a wash under .50, and it would just cycle through each time I tried setting it to "1". I wasn't allowed to edit the field it had asked me to, so it seems to be a UI issue.
1. Make a note of which stocks you're being prompted to fix
2. Go back into the federal section, to where you uploaded your securities document.
3. Click "Review"
4. Click "Edit" for the Robinhood document
5. Verify the acct information.
You should now be on the "Review all your Robinhood securities sales" list page. Find the stocks that are giving you problems, and click the "edit" pencil icon on the right side of the list item. This will bring you to the individual stock page. Scroll down to find the input field for box 1g. I put in 1.00 and the filing was accepted.
