Cropped screenshots are useless. Sorry, but without any info about your actual preview settings in the palette, the comp framerate, your system and so on we really can't tell you anything that would help fix the issue. From simple framerate mismatches to unwittingly having changed a preview option there's just too many things that could be at work here.
I agree with what Mylenium said. Please share a screenshot of Composition Settings and Preview Panel to give something to start. A screen recording that sows the problem would be even more helpful.
Looking forward to your response.
your screenshot simply shows 15 frames which means the duration of your comp is 15 frames which is less than 1 seconds.
Change the duration of the comp, ctrl + K
As I mentioned earlier, Change the comp Duration,
the screenshot shows 15 frames, which is less than 1 Second, ( Hours: Minutes: Seconds: Frames )
change the duration to anything else like 40 seconds 0:00:40:00
One of the most priority answers that will help solve the issue with a short duration of Comp.