I could've literally destroed Metal Fisher by uploading config.g that contains broken M665 command arguments.
The line was M665 160.00 R81.08 B75.00 H177.58 . It changed Fisher's mode as Cartesian not Delta implicitly by mistake.
Homing all was pushing the nozzle off the print bed.
Reset and power cycle, rebooting wouldn't fix it.
Gcode console didn't show any error messeages either.
Out of frustration I typed M665 in Gcode console,
"Printer is not in delta mode."
And my immediate thought 'What?! How could it be Cartesian'
I checked the wiki page and it says M665 command changes Cartesian to Delta mode.
Uploading config.g that has correct M665 command fixed the problem.