Pots of Bulbs

A couple of years ago I potted up six of these purple plastic pots with spring bulbs (probably the year I broke my shoulder and couldn't do the garden), each year after they flower I put them round the back of the house and bring them round to the sunny front to flower.
They seem extra full this year so think the bulbs must be multiplying, must try and get them transferred to the garden this year and redo the pots for next year.