Very common for race cars to lift the inside wheel in some or all corners, it comes down to how hard your springs and sway bars are. The common, internet friendly and totally wrong approach to track suspension is to put hard shocks, springs and sway bars on for track use.
In the real world, you run the softest springs you can while keeping all 4 wheels on the ground for maximum traction (there is a lot to that too, keep in mind the inside rear wheel will never have much grip as there is little weight on it). Soft springs keep the wheels on the track over bumps/ripple strips/small cars thereby maintaining traction. Add sway bars of the correct stiffness to adjust the understeer at either front or rear to your taste.
BTW a stiff chasis makes a huge difference to whether a wheel will lift or not. It is very easy to lift a corner once a proper roll cage is installed.
Throw all of these comments out the window if the left rear shock is siezed lol. drop by your local pedders and hand over $14 of your hard earned to get the shocks checked.