How long have you been working with Premiere Elements 13 Mac or in general any Premiere Elements version?
I ask since what you describe sounds like typical behavior of what can happen when file is added to an existing Timeline.
To have avoid or minimize these unwanted events you hold down "keyboard modifiers" Alt or Ctrl key (Windows) as you make these additions or moves in an existing Timeline.
I am strictly an Elements Windows user. So, I am assuming that the counter part of Alt here would be Option key. Please review the Adobe document on arranging clips on the Timeline to determine if any of that information is helpful in your present situation.
Thank you, A.T.
I ported over from Final Cut and wasn't expecting that. I have the rest down pretty well.
Thanks for the reply.
This cuts and shifts with additions to an existing Timeline become more challenging as the complexity of the Timeline content increases.
Typically this type of issue is dealt with
a. holding down a keyboard modifier key as you make the addition and/or move
b. sometimes selecting a block of clips and moving the block with the mouse cursor or applying Group command (Expert workspace Clip Menu/Group) to the selection for a more permanent grouping of the clips.
c. other (this becomes the interesting part)
Please practice with the keyboard modifiers and, as you schedule permits, let us know of your progress.