Two Shelly's with different WiFI signal strength

I installed two Shelly 1PM devices one next to the other with WiFi repeater in the same room (only 2 meters from Shellys). I also have Shelly EM devices. On all devices I have strong signal, cca. -45dBm but only on Shelly 1PM it is weak with -75dBm. Remember it is right next to another Shelly 1PM with -45dBm. What is happening? Is antenna in this Shelly broken or? Please, advise.

No, I never enabled this option on all my Shelly devices. I have issue only on this one. I also changed the antenna on this device with older Shelly 1PM device which had strong signal but it didn't help.

Shelly PCB:

[Blockierte Grafik: https://i.ibb.co/LCFbN1B/20220128-101430.jpg]

Antenna:

[Blockierte Grafik: https://i.ibb.co/gyjYp9g/20220128-101451.jpg]