We can't know. You have not even told us what program you refer to (Premiere, presumably?) much less provided any details about your system, exact versions, your project, workflows, settings and what not. if this is a specific technical or usage question ask in the forum for the relevant product.
Provide the name of the program you are using so a Moderator may move this message to the correct program forum
This Cloud forum is not about help with program problems... a program would be Photoshop or Lighroom or Muse or ???