I’ll choose a kick and it will sound fine until I press the stop button in the playlist and it switches it to a very weak/thin sound (see pics of waveform after it stops) I’m using Fl Studio. How do I fix this? Thanks.
Hi there and welcome to the forums ! 
It is likely that you have a MIDI CC assignment to your keyboard space bar if this happens each time you Start/Pause your DAW playback.
Looking at your screenshot, might be on the Length slider since it seems to reset to 50ms.
Right Click on the slider and then REMOVE CC:value you see in there.
If it’s not the parameter that’s resetting, the trick is to look & find what knob or slider is resetting to default each time you Play/Stop your DAW playback or hit the keyboard space bar.
Hope this helps !
Cheers
Ah yes that was it!! Thank you so much! It was driving me insane.
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No worry, you’re welcome !
Yes, it’s a tricky one when it happens the 1st time ! 
Cheers