UI/UX problem in Build a JavaScript Calculator

Tell us what’s happening:

In https://learn.freecodecamp.org/front-end-libraries/front-end-libraries-projects/build-a-javascript-calculator we have:
User Story #13: If 2 or more operators are entered consecutively, the operation performed should be the last operator entered.

But in the tests there are:

13. If 2 or more operators are entered consecutively, the operation performed should be the last operator entered (excluding the negative (-) sign.

I think there’s a UI/UX flaw when designing it like the test is recommending? Especially as there’s no “backspace” required in userstories?

Your code so far

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3915.0 Safari/537.36 Edg/79.0.287.2.

Link to the challenge: