Monitor interface is getting packets for other channel

I am working with a a monitor interface. It is correctly configured and working.
I use a tp-link Archer C6 v2.0 (OpenWrt 19.07.3, r11063-85e04e9f46)

The interface is configured in channel 1.

config wifi-device 'radio1'
	option type 'mac80211'
	option hwmode '11g'
	option path 'platform/ahb/18100000.wmac'
	option channel '1'

config wifi-iface 'wifinet2'
	option device 'radio1'
	option mode 'monitor'
	option ssid 'OpenWrt'
	option ifname 'mon0'

root@OpenWrt:~# iw dev mon0 info
Interface mon0
	ifindex 20
	wdev 0x100000007
	addr cc:32:e5:b3:4f:ad
	type monitor
	wiphy 1
	channel 1 (2412 MHz), width: 20 MHz (no HT), center1: 2412 MHz
	txpower 20.00 dBm

To test the interface I transmit packets with another router tp-link TL-WR940N (OpenWrt 18.06.4, r7808-ef686b7292)

I expected that only packets in channel 1 are received in the monitor interface but when I set the tx router in channel 7 I can see the packets in the monitor interface although it is configured in channel 1.

root@OpenWrt:~# iw dev
	Interface wlan0
		ifindex 8
		wdev 0x3
		addr 98:da:c4:64:31:a4
		ssid Banco_RF
		type AP
		channel 7 (2442 MHz), width: 20 MHz (no HT), center1: 2442 MHz
		txpower 22.00 dBm

Is this posible? Is it a way to fix the channel to get the packets only for the desired channel?