Manage Resistance to Change
During change there will be people who are hesitant or uncertain about what is happening. This normal, and should be expected. Don't think of it as a bad thing that needs to be "stamped out". When you see resistance, treat it as data - data that is telling you there is a gap in your change plan that needs to be addressed.
Resistance occurs when impacted people don't support the change (buy-into it) and they feel threatened by it, or deem it unnecessary. This can happen for a number of reasons and can look different depending on your organisation (what is appropriate in your business).