Sometimes I will see the same room type returned in the search results more than once, without a visible difference. Why is this?

There might be fields in the supplier response that iVectorOne doesn't currently support, which then doesn't give iVectorOne an obvious differentiator to use when returning search results.

Examples of this can be a rate key.

To see what is being returned from the supplier, you can use &emaillogsto as a parameter in the search request (more information in the documentation) - this will email the specified address