There are multiple issues with your aircraft, two of which are related.
When you're trying to roll, you must have actually inputted yaw control instead, which is why you are rolling opposite to how you'd expect.
As for why you roll so much, it's because your wheelbase is far too narrow for your aircraft, especially with how much the front wheel can turn. You need to offset the rear landing gear more to the side.
There are multiple issues with your aircraft, two of which are related.
When you're trying to roll, you must have actually inputted yaw control instead, which is why you are rolling opposite to how you'd expect.
As for why you roll so much, it's because your wheelbase is far too narrow for your aircraft, especially with how much the front wheel can turn. You need to offset the rear landing gear more to the side.
Here is your updated jet for you to inspect.