Can you send us your whole Skyline document?
In Skyline, you can use the menu item:
File > Share > (complete)
to create a .zip file containing your Skyline document and supporting files including extracted chromatograms.
If that file is less than 50MB you can attach it to this support request. Otherwise, you can upload that file here:
I cannot tell for sure what is going on from the picture that you attached. Here are some things that could be going on:
1. You might be trying to extract MS2 chromatograms from DDA data. Because DDA does not sample precursors on any sort of predictable schedule, MS2 chromatograms extracted from DDA data may appear to be truncated, and may have long stretches of retention time without any points. You should tell Skyline to only extract MS1 chromatograms from DDA data.
2. You might have set the Retention Time Filtering to a really small number. That setting is at "Settings > Transition Settings > Full Scan".
I'll know for sure what's going on when I see your Skyline document.