Never had this bug but the steps below should fix your console position:
1. Close the game and open this file with a text editor:
Deadlock\game\citadel\cfg\machine_convars.vcfg
2. Find the line with:
"panorama_console_position_and_size" "590.25|267.75|966.75|622.50"
3. Replace the pipe-separated numbers with something like 100:
"panorama_console_position_and_size" "100|100|100|100"
4. Launch game and hopefully the console is within bounds and can be moved/resized again.
I wonder if some of the values in your config are negative numbers, if so maybe these should be limited to positive values to prevent the console from somehow getting positioned "off screen".