Why when I try to make a render of a car it looks like it's floating?

When you select a part, it turns blue (or green or orange) but that's not only what happens, if you check closer you'll see, that ther is a orange wireframe cube around it, and that's it, that's why your floor looks below the part.

  1. Step 1:

    First you see this:

  2. Step 2:

    The solution is simple: locate the wheel missaligned (maybe all of them are missaligned) and do what you shouldn't do in regular conditions, add unnecesary mates

  3. Step 3:

    Now you're wheels are aligned

  4. Step 4:

    The box is aligned:

  5. Step 5:

    And your floor is fine:

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