DFS referral taget on Azure VM

Hello guys,

I've a problem on DFS. I've two entries as a target folder on DFS namespace, I set the second target as "Last among all targets" so users should never be referred to this target unless all other targets are unavailable.

I don't understand why randomly on this shared folder I find some files duplicated ending with the name of the both target server, so it means that second target server was used due to the first one was not available (I think)

But I am not sure of this, so there are logs to find out what's happaned to the first target? and why these files was been created?

thanks for your support.

Andrew