I complained to DFIN (the company that writes the HTML 5 code), and they are working on fixing the problem. -
"An update from our team:
We will be making a fix to allow for the four decimal points instead of 2. It will automatically display correctly on OTC once this is put into prod but we do not have an ETA at this time.
In the meantime, please know we are working on making an update but for now you can click on the table view of the 1-day or 5-day chart and get the prices.
Kind regards,
Edgar Online Support"