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If that is the case, you do not have a 4.2 UW. The highest UW GPA simply cannot be higher than whatever the top mark is, and that mark sets the scale. If the top mark is 4.1 and you have a 4.2 then the 4.2 is weighted.
This probably has a ‘get off my lawn’ feel to you, but you never know who will read what on CC, and knowing the difference between UW & W GPAs can actually make a difference. For the purposes of this post, it appears that you have a 4.0 (ie, straight As for 4 years).