Hey there. Sounds like you may have encountered a bug. Which version of the game are you playing on?
And the dungeon/floor that you got soft locked?
For some dungeons you can only move forward, up, down and cannot move backwards. (This only applies for the first few dungeons). Intentional for choice pathways and decision making. Theres is also an arrow movement legend/indicator on the bottom right of the dungeon level that highlights and indicates allowed movement.