Version:
ImmersiveRailroading-1.7.0_1.7.10

Bug Description:
When I right click a vehicle (cars, trains) to mount it, the GUI doesn't appear and you can move
freely around your world as if have never clicked the vehicle. When "dismounting", you are
teleported to the location where you right clicked the vehicle.

System Information:
OS: macOS Catalina version 10.15.1

System Memory: 16 GB

Allocated Memory: 8192MB

CPU: 3.6 GHz Intel Core i7

GPU: Radeon Pro 560 4 GB

IR-Version: 1.7.0_1.7.10

Forge-Version: 1.7.10 - 10.13.4.1614

Modlist:
https://pastebin.com/WDLnRXR5

latest.log
https://pastebin.com/8JmuKqJc

@whatsapp2 is there a link to your pack or is it custom? I'd like to try your pack with a IR version with debug turned on

It's a custom mudpack, but I can provide you a Dropbox link with the mods I use
https://www.dropbox.com/sh/ji4yt5l24mvfl1c/AAA0OyoWK8tqgcYQhLw3_Wcra?dl=0

I can confirm this is an issue. Would you mind taking the time to go down to only IR and adding in a few mods at a time to see which one is causing the conflict?

I was testing a few mods until I discovered it was the mod called "BetterSprinting++MC-1.7.10++v1.1.3.jar" causing the bug; which is kind of weird, considering this mod is to speed the creative flight up to 8 times more

Makes a lot of sense, actually. Both mods affect player movement. It's likely that IR is moving the player but the last player location cached by betterSprinting isn't updated when the train moves the player, so it snaps them back.