I just got into one of my worlds when I noticed that when I try to sprint jump it's harder to do. Before to sprint jump I press w to move forward, then press the sprint button then the jump button, which is how I have it memorized but now when I do that it doesn't work anymore, instead I have to press w, then the jump button, the the sprint button, which goes against my muscle memory. Also, it makes it harder to go upwards while swimming which has made me drown before, and it makes it impossible to jump forwards while sprinting, making three and four block jumps impossible. But for some reason on a different computer jumping while sprinting works fine.