Segment over action url returns actions with other url

I’m looking at the report on a custom dimension. Since I use different URLs, I wanted to search for the custom dimensions of a specific URL. For this purpose I have created a segment :
Action URL - Contains - My domain name

In the report, when I open the sub-tables of the values, I get several different action URLs, including some that do not contain the specified domain.
What could be the reason for that?
How do I get the report from Custom Dimensions that only come from one domain?