Occasionally, replicates seem to get "stuck" - they are unable to move. When this happens, their sprite animation acts a little glittery - like they are trying to move but can't. Usually selecting the replicant and directing them to move just to the left or right get's them unstuck and they go about their business. It seems to happen the most when a duplicant uses a sink, but it occasionally happens elsewhere.
Steps to Reproduce
This is hard to replicate - it seems to happen randomly.
This issue has not been confirmed by a developer yet.