Pulling backwards/left while flying upwards

I am experiencing an irregularity while flying upwards on multiplayer servers, where is pulls backwards and to the left

I recently did a clean reinstall of windows on my computer. I downloaded Java and Minecraft and wanted to play on my regular OP prison server (arkhamnetwork), and I thought that it would work as smoothly as it had done previously, where I have been able to fly upwards without any random movement disturbance.

I logged on and started flying, and that's when I noticed this annoying pull to the left and back while flying upwards, this has kept me from playing the game for quite some time now. I have tried doing another clean reinstall of windows, but it still has this pull while I'm flying. I have all the necessary drivers, and all of my other games work just as they did before. I have not been able to replicate the bug on my other computer, even though I did everything just the same (except doing a clean reinstall of windows). I could record a short clip and send it to you, just to demonstrate.

Steps to Reproduce:
1. Clean install of Minecraft
2. Launch Minecraft and let it update
3. Log onto server which allows flying
4. Change chat scale settings/texture pack
5. Notice disturbance while flying upwards