Annoying transitions problem

"Transitions" are perhaps best thought of as something that can be applied across the cut between clips, directly on the clips.

When you need to add layers with graphics & adjustments & effects, that gets a bit more complex than a basic transition. And is also fraught with more issues. Because then you are dealing with a complicated multi-track effect and not a simple transition.

Noted Premiere expert Jarle Leirpoll teaches how to make your own mega-effect multi-track "transitions" using even Track Mattes and multiple video mattes and shapes ... all animated ... and then reapply them at will within Premiere. It's good to know how to do this especially if you're going to acquire them from "out there".

As in my experience, trying to use most of the "transitions" from "out there somewhere" involves at least a nominal amount of futzing with the thing to make it workable. Very few simply work "outta the box".

Neil

 transition from some random pack

Well that might be the cause.

What is the origin of this so called pack.

You must realize they are not real transitions, but rather a bunch of effects thrown together with keyframes applied.

If they do not match the timeline most of the time they will not work.

Please read below link.

FAQ: What information should I provide when ask... | Adobe Community

And it happens randomly, some times in can work on other file, sometimes not