Problem with layer clear unexpectedly

I’m on v1.3.7 Steam version Windows 10

Not sure if this is a bug or something on my end but when I press “A” then “1” or A+1 the whole layer disappear.

If I press Ctrl+Z it shows “Undid Clear” at the bottom right corner.
This stops happening if i delete the “Backspace” shortcut in clear command.