There can be lots of reasons - getting tense, tired, lack of flexibility, strength or control, or wrong technique.
The most common problem I see is people using their leg muscles to drive hip moves. Then when you ask them to do something else with it they have these big hard to control muscles trying to do fine work - and wait until you try and walk with them. With few exceptions most moves need to be driven from the abs.
The other one is people don't realize how long it takes to lay down new neutral pathways. When you do a move you are firing a bunch of muscles - and they all have to do it in the right order. This need to become automatic - hence drilling. But you have to drill the right move - so do it slowly until you can do it 100% corrrectly when you sped it up - otherwise you are just teaching yourself to do it wrong.
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