Dell Wyse 3040 hosts file

Hello! I have a lot of Dell Wyse 3040 and found trouble with use settings network name by file hosts. I publish this file and all working fine. I uploaded the file with the new settings, but the old ones, uploaded for the first time, remain in the client. I tried a file with the same name with others and nothing helped. Even resetting to the default settings does not delete the records received for the first time. In client settings item hosts is empty, but host record are present!

Firmware version is 9.1.6108

Any ideas?