Do I need to send all of my ACT scores?

Recently I read a post somewhere that said that your acceptance could be rescinded if you didn’t send all of your test scores. On the website it says “We require all scores and will use the highest scores from a single administration” but how strict is that requirement? I only sent one… I don’t understand the reason for sending multiple test scores, especially since my superscore is the same as my score from a single test. Maybe they would like to see how many times I took it and the improvement each time? I didn’t stress too much about it before but now idkkkkk

The UC website clearly spells out what you need to do in terms of test scores:

Report ACT and/or SAT scores on your admissions application, then request that an official copy of the scores be sent to us from the testing agency. You can have your official score report sent to one UC campus, and all campuses you apply to will receive it.

In the College Board’s Score Choice module, ensure that all scores are sent to UC. We require all scores and will use the highest scores from a single administration.

For the ACT with Writing test, we will focus on the highest combined score from the same test administration.
For the SAT Reasoning Test, we will focus on the highest total score from a single test date.

ACT does not have score choice, but you need to send all the scores. There is always the chance that you could be rescinded for not being up front about your testing history especially if your test scores on posted on your transcript.

Should I send them now after having already sent in my best score a month ago?

I would send them in since the deadline is Dec 31 especially if they are on your transcript. Better safe than sorry.

It’s not on my transcript but is it possible it is already under review? I’m being irrationally afraid that they’ll notice the oddity

To update… I was being stupid earlier. Definitely send in all test scores.