Minecraft Sneak when turn off in inventory?

I recently had the problem that when I open my inventory and move items with Shift-Click, I sneak at the same time. Changing hotkeys didn't work, and it's getting annoying.

I play with Forge, but only have one minimap mod installed (Xaeros).

Does anyone know how I can solve the problem? Because I don't know what else I can try.

There doesn't seem to be a fix at the moment.

It annoys me too much…

I also want to know some kind of fix or mod for this, it's pretty irritating.