Thank you for the info.
I believe I've found the issue.
Because the sheet is larger than the default Max Size of 2048, you need to change it to 4096. This will fix the blurryness and in turn the overflow of the sprites.
After changing it to 4096 and hitting apply, if you could slice the sprites again using 96x84 and let me know if that works as expected that would be great.
Thanks.