Magic keyboard numbers row stopped working

So, I have the ten keyless keyboard and today for some reason the numbers 1..9 stopped working, § and 0 keys are fine but numbers row don't do anything even pressing opt. I've checked for mouse keys option and it is off and forget/ reconnect bluetooth device with no result, also tried to connecting to my iMac with usb cable but nothing seems to work.

Any ideas on how to fix this weird behaviour or could it be a hardware issue?

Many thanks.