Applying effect causes footage to slip

[jennahanes]

I'm working with a set of footage where I need to cut out a portion of the clip and apply a simple scale up effect to the cut-out segment. When I change the scale on the smaller clip, the footage "slips," meaning the placement and length of the clip remain the same, but the footage within the clip changes to a different segment of the larger footage. It's as if I somehow use the slip tool on the smaller clip whenever I change the effect controls.

Please let me know if this is a known issue, I cannot find any solutions on Google.

[Ann Bens · Accepted solution]

Footage with variable framerate tends to give odd issues.

If the footage is variable framerate convert to constant framerate with Handbrake before bringing into Premiere.

[jennahanes]

Incredible, thank you. We normally record in CFR and I forgot to check.