Problem with LAN and WAN ports speed

[Rerork]

Hello. I am new to working with OPNSense. I have a mini PC with OPNSense and Xiaomi Mi 4a Giga version, they are in a bundle, Xiaomi is configured as a repeater. A few days ago, a problem arose, the speed of the ports instead of 1 Gbit/s shows only 100 Mbit/s. Today, a specialist from the provider came and checked all possible options, replaced the cables, re-crimped the connectors, switched from PPPoE to DHCP and back, no effect, on the mini PC, the LAN and VAN ports still show 100 Mbit/s.

What could be the problem? I ask for your help.

OPNsense version 24.7.9_1 amd64

Mini PC specifications:

Intel(R) Celeron(R) CPU N2840 @ 2.16GHz (2 cores, 2 threads)
2 ports 1 gbit/s
4 usb port
Wifi module Intel 7260 AC (not work on OPNsense only "Infrastructure BSS")