That is pretty normal behaviour for wc or shy specimens. Any moving in the presence of predators can be dangerous and makes them visible as prey. So they try to move as little as possible as long as they do not feel fully secure.
On the other hand, eating is important. So, if their fear is not too big, they may catch feeder insects -but then immediately stop moving. If you leave them alone, they normally swallow the prey soon. If another prey item is offered, swallowing the first is a prerequesite before catching the second. So they dare to chew in this situation and stop it wehn having caught the next item.

Hope that helps

Ingo

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