problem with mikrotik rb951ui-2nd

Hi
I have a router Rb951 -2nd, when i connect the router to the wifi modem with wireless setting on a mikrotik, an other device like mobile phones and lop tops cant load normally Instagram or other web services i dont know why??? i mean wheb router connected to modem with wifi connection other device cant load normally Instagram or other services but when i turn off the wireless connection to the internet modem and use router with lan on client mode we haven’t any problem…!!! and haven’t bridge on router
on mikrotik i have VPN service
please help me and tell me why i have this problem only on wifi
I don’t know if i want mikrotik on a wifi like client without any cable for modem to router what i have to do?
I have screen shot from torch and another setting on attachment this topic.
https://imgur.com/a/AdKcZ0f

Hi Parsa
where is your attachment ?

now i will edit
config->>>>>>> https://imgur.com/a/AdKcZ0f

attach your config
/ip firewall export

jan/23/2019 16:51:43 by RouterOS 6.42.1

/ip firewall nat
add action=masquerade chain=srcnat disabled=yes out-interface=wlan1 src-address=
172.17.1.100-172.17.1.120

wlan setting
Flags: X - disabled, R - running
0 R name=“wlan1” mtu=1500 l2mtu=1600 mac-address=B------B3 arp=enabled interface-type=Atheros AR9300 mode=station ssid=“WIFI-1” frequency=2412
band=2ghz-b/g/n channel-width=20/40mhz-Ce secondary-channel=“” scan-list=default wireless-protocol=802.11 vlan-mode=no-tag vlan-id=1 wds-mode=disabled
wds-default-bridge=none wds-ignore-ssid=no bridge-mode=enabled default-authentication=yes default-forwarding=yes default-ap-tx-limit=0 default-client-tx-limit=0
hide-ssid=no security-profile=profi1 compression=no

check your WLAN card TX power and decrease it .
check Protection mode on your internet modem

whats your mean tell me please

and i haven’t any setting on my modem for blocking

check your wlan tx-power in your RB
check your wireless protection mode in your internet modem wireless settings
change your station mode to station-pseudobridge in MikroTik

thanks for help
i’v found problem in this project,this modem (humax HG100RE-AK or HG100R-L2) have not normally firmware because in russia they changed firmware and this modem can’t work normally but i did new test on other modem and nothing without problem worked.
unfortunately in this ISP no one can’t help and they said we can’t give it to you user and password on this setting on this modem and you are a client you can only change a little setting with user admin like (wifi ssid,password,DHCP…). it was my problem.
thanks a lot
this scenario with
RB951Ui-2nd
Cable modem HUMAX (HG100RE-AK or HG100R-L2)