Web GUI
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Okay, let's try it
move the GUI port to a good height, such as 50443F.E.:

you know I wouldn't use such an ISP

you still haven't written down your hardwares types and connections methods - 
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@Ilya-V said in Web GUI:
you know I wouldn't use such an ISP
I would also change the provider, but we have no analogues)you still haven't written down your hardwares types and connections methods
From all providers settings come via DHCP.And the answer was ?
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I would also change the provider, but we have no analogues)
From all providers settings come via DHCP. - 
if there is no port filtering..... - , you say that 1:1, then something is still missing (NAT-NAT-NAT)
we would expect a drawing from you about the system (in any form, even by hand)
and raise the GUI port to a higher range- I would still pull out the WAN1 cable (if it is possible of course) and see what happens then
-I think you will be surprised what is not working in addition to the GUI yet 
the load balancer can hide a lot of things in front of your eyes, if you don't pay attention and you think everything works great on both WANs (Round-robin)
 - I would still pull out the WAN1 cable (if it is possible of course) and see what happens then
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if there is no port filtering..... - , you say that 1:1, then something is still missing (NAT-NAT-NAT)
we would expect a drawing from you about the system (in any form, even by hand)
and raise the GUI port to a higher rangeI would still pull out the WAN1 cable (if it is possible of course) and see what happens then
-I think you will be surprised what is not working in addition to the GUI yetthe load balancer can hide a lot of things in front of your eyes, if you don't pay attention and you think everything works great on both WANs (Round-robin)

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THX:
-I wonder what tool / device (CPE) produces this?
-do you have access to this tool / device?
-can you change the GUI port?
-what about WAN1 test, can be disconnected and tested
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-I wonder what tool / device (CPE) produces this?
-do you have access to this tool / device?
-can you change the GUI port?
-what about WAN1 test, can be disconnected and tested- device type unknown
 - no access to it
 - I will change the port for verification and write the result
 - WAN1 will not work in the near future
 
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сменить провайдера и мне не помешало бы, но, увы, нет идентичного,
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@valentinius thanks for your comment, but we are beyond that

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@DaddyGo Yesh, you are right and i am really glad that you have supported me! Wish we were in front of that(