new Record at Hosts with IP gateway & access point Mac address

i have unify AP , & mikrotik v5.20 . some cell phones after join wifi network. i see log in process is succefull, bu new record add to hosts file include MAc address for unify APS with gateway ip( so mac address is duplicated with two or three mac address. when mac address takes ip gateway the network started stop , till i remove that record from hosts file. and block the cell phone ( huwawi nova 7 ) also found new cell phone ( huawie nova 5t ) same issue.
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