Solo, not series

I recently posted one of my stories (The Human Cuckoo - Book One) from a trilogy I have published on Kindle, partly as a teaser. The story is complete and standalone.

Since I do not intend to publish the other two stories from the trilogy, I marked it complete and a solo. However, it keeps getting reclassified as a series, which it is not, and I suspect some software is seeing the Book One and automatically assuming there are going to be other books.

Is there any way of preventing this?

Lin Dale