Mikrotik detective: Why do two wi-fi points work differently?

Question

network hardware

Hello. I am a layman in networks, I set everything up on a whim and instructions. But here's the dead end:
Why do two identical MikroTik hAP ac² work differently?
Model: RBD52G-5HacD2HnD and RouterBOARD D52G-5HacD2HnD-TC.

I updated the firmware on both to the maximum, on the first I made a backup, on the second I reset the factory settings and restored the settings from the backup from the first. In order not to conflict on the same network, I changed the "Identity" on the second point, changed the MAC of the bridge to the native one, and made a MAC reset for each interface. On the DHCP server, both points on mac were assigned static ip.
The first one itself perfectly receives ip from the DHCP server, and the second one does not (via Winbox by zeros: 0.0.0.0). In order for the second one to work, I had to dance with a tambourine: manually add ip to ip->Addresses (although on the first one it set itself up there, which DHCP server issued it), and enable it in ip->DHCP Client, otherwise it didn’t work.
Now the second point also interacts with the DHCP server, "receives" its ip (in fact, it requires it, scratches it out, as I understand it). But why can't it work the same way as the first one, without additional troubles ?

PS: Maybe it's important - on the first cable from the DHCP server comes to the first port, and on the second - to the third port. Reason: if you plug it into the first port, it starts to fail, blinking inadequately. The cable comes from MikroTik CRS112-8P-4S-IN - there is PoE, but it is forcibly turned off on this port, it should not affect.
PSS: DHCP server is configured on a separate box (Mikrotik hEX S).

Answer 1

An interesting opus, but you know that the poppy of the first raised port is hung on the bridge, only if you beat it with your hands, it will always be the same.

Answer 2

Are the firmware versions the same?
What's in the DHCP server logs when the second one can't get an IP? What is in the logs of the very second mic at this moment?
If you reset the second one and set it up with your hands to receive a DHCP port on the WAN, does everything work correctly?
If you leave only the second router on the network (turn off the first one), what happens?
And finally - is it really a live cable to the second router? (you can check by moving it to the place of the first one)

Answer 3

The DHCP client only listens on ether1 by default.
You need to specify in IP - DHCP Client the Interface through which the point is connected to the DHCP server.