Animation is faster on timeline then when rendered

I’m making a simple animation and I noticed that in the timeline, when I’m scrolling trough the frames by pressing the arrow keys, the animation is very fast. But when I render it out, it’s a lot slower.

Why is that? Why is it so different?

You must share the Blender version and render engine you use. Share the .blend file, at least the file with the used configuration. Some screenshots.
Otherwise it is difficult to help you.

IF you are scrolling past by holding the arrow key right it is not playing the animation at the correct rate.

On the timeline there is a play button… nest to it a dropdown set (by default) to No Sync… myself I set it to AV sync so it plays audio and video in sync, and Frame Dropping is also fine.

That was it. Thanks.