Gladiola bulbs being dug up
Three times in last month whilst tidying up various flower beds in garden, I've moved some gladioli bulbs (and some attached to a reasonable sized plant) that I've dug up to different locations. Come the next day or so, I've found a big pit where I'd planted the bulbs and nothing where they'd once been. The last time I moved the bulbs I heavily patted down the soil and placed them deeper but it made no difference.
I don't want to imagine what's eating them but I do want recommendations for how to move them without them getting dug up and eaten as I have more to move.