Who is asking for their money back? Why?
The team is negotiating and trying to resolve the issue with one of the investors who no longer want to wait for the completion of the project and asks for their money back
It is very strange, why first invest and then demand money back. It looks like it's just the machinations of competitors or scammers.
Market change and people change their opinion. I think if you are not sure do not invest not to change the opinion.