Sorry not sure why it's happening. Can you try jumping from the yellow pod? As mentioned by @Polanski the jump height could definitely use some improvements. See test on Firefox below.
Hi @Xentios! I was able to replicate your scenario thanks to @cubixsphere's comment. Seems like there's an issue with the jump height being tied to the framerate. Current workaround is capping it to 60 or 30 using your driver settings or something similar. Again, really sorry for the inconvenience.