This is the fault of the moderator.

A good moderator will be able to control conversation and steer it back to the main topic or issue at hand. They will be able to quiet interruptions and be both supportive and encouraging that the person whose turn it is has their right and allotted time to talk. They will be a role model of appropriate behavior expected in a group format and discussion. They will step into and discourage interruptions making it clear the person whose turn it is has attention of others in the group. They will also make it clear the format of the meeting, including rules and expectations. This all is difficult to do and takes a skilled individual to make it work.

At my group the rules are read out prior to each meeting. Attendees must agree to the rules before they can participate.

One of the rules we have is that there is absolutely no commenting on what a person is saying during their turn unless specific permission and invitation has been granted to do so. If the moderator feels that the other person/people are going off topic or taking over they are cut off and invited to share their own stories at the end.

My suggestion is to talk privately to the moderator and express the difficulties you are having. I suspect your moderator is less experienced at the job of doing so. Please keep in mind that they may have their own anxieties limiting their ability to take better control of the situation. They themselves might then require their own encouragement. Regardless though, they need to learn to show by example the way to respect each individual participating.

Good luck.