Importing samles to fit tempo doesn't work! Please help!

Hi, I’m trying to import samples from my library that really doesnt fit the tempo of the project. It only works when previewing the sample, but not when I import it. I made a little video to make it clear what my problem is. How do I fix this? it’s so weird that it works perfectly when previewing the sample in the mediabay but not when importing it into the project… Thanks!

https://www.youtube.com/watch?v=q8fO14oT090&feature=youtu.be

OK found out that my samplerate was 44.8khz, what is the difference between that and 44.1?

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