So there are word count limits on various submissions that are not properly labeled as limits rather they say "recommended". There will be an non-descriptive error, that will require you to contact support. The site itself is a technical nightmare, the banner reads "Since 2000" which is roughly the last time the site appears to have been updated. It wont let you try to submit until AFTER you have paid a significant subscription fee.
The site is unintuitive, technically faulty, and intentionally obstructive. I lost $100USD, DO NOT USE THIS SITE.
The site was recently updated and is a fully functional site. It works with all devices (computers and phones). If you can not submit after upgrading that does sound like an issue with payment. Please contact us directly and we can help you resolve it.