Many IP belong to one Senao Antena

I want to help on htis case which hapes to my mikrotik router.
When i check the IP/ARP i can see there a few IP whiches belong to one MAC Adress of Senao Antena.
i don’t know how this hapens because i used one IP with one Senao Antena.
And in this case at many of my client the network fels down.
If you have any question please don’t hesitate to ask me.
Please help me…

You should post more information. What exactly is linked to that “senao antenna” ?
If it is an access point, maybe someone put a switch, and linked several stations to it.
But, again, describe more precisely so that you can be helped.

Ok i will try to give more information. I have a Router and three sectors conected to Router. And I use a Senao Antena as a bridge to conect a client to my sector with its SSD.
Its MAC belongs to one IP. But when i check the IP/ARP that bridge conects to lot of IP address. Which makes my network confused and i this case many clients goes out of network.

What kind of ip addres does it have ?
Is it a fixed ip ?
Even so, what exact model of device does the client has on site ?
If it’s not a true transparent bridge, than it’s mac is linked with you, and any client in back of it will be seen by you with that mac. Be it one or ten.
Probably, the client has more than one pc connected. Can you check this ?
If not, somebody may be fooling around with your network.