Sometimes you may see gaps in the sounds that occur sometimes at the beginning, middle, or end.
This is normal. Many of our sound libraries are made so sound files work in tandem. They combine many microphones paired together so that users can pick which perspective or tone they prefer. In some cases, there is no sound for portions, which appears as the gaps you observed.
In short, the gaps are there to ensure the clip matches with alternative recordings. Below is an image that explains more, you can see the tracks synchronized to keep time, with gaps from perspectives without sound.
We do include Reaper and Pro Tools sessions that help get an overview of all these similar tracks working together.