Performance parts bugged

Product: Need for Speed: Unbound
Platform: PC
Summarize your bug

(Online Mode) Performance parts keep getting reset to their previous state when upgrading and applying to cars.

How often does the bug occur? Every time after the initial upgrade of a car. Session change/restarting the game seems to have no effect.

Steps: How can we find the bug ourselves?

Buy a new car, apply upgrades, tune handling, look at current performance index. Exit garage, if performance index is still unchanged, go back, try to apply different levels of upgrades. This results in the car visually being upgraded/PI changing in the menus, but otherwise having incorrect parts (Tires, transmission with manual gearbox are easiest to test)

What happens when the bug occurs?

Performance index keeps jumping up and down, and parts are not being applied correctly. 

Example 1.: We tried a Drift Pro playlist with my friends, 2 of us had cars upgraded before Vol. 9, 2 of us had newly purchased and tuned cars. Pre-Vol. 9 cars had no problem, newly purchased and upgraded cars were given the Drift Pro handling model, but they were suddenly gripping mid-drift, an effect similar to trying to handbrake-turn in a full-grip car, or pressing the boost nitro mid-corner.

Example 2.: Bought a new car, upgraded it, put a 4-speed gearbox in it. This was fine at first, but now that car is permanently stuck with a 4-speed gearbox, even if I upgrade it further. It was easy testing it, I set the gearbox to manual, started shifting up, highest gear was always the 4th, even with the 5 and 6-speed gearboxes.

It is also possible that Handling settings aren't getting saved either, because I keep Brake-2-Drifting with fully grip tuned cars with both the Gas and Brake tap to drift settings set to off.

What do you expect to see? Car upgrades/settings correctly being applied and saved.