Make sure the telescope is cooled off completely and
This telescope is from a famous ATM here in Brazil.
I recently aligned the telescope mirrors, but I didn't check that they were aligned 100% correctly because I didn't do a star test. I will do this today to confirm whether or not it is collimation.
But I believe that this type of effect on the Moon would only appear if it was extremely decollimated, or am I wrong?
Because mirrors reflect all of the light equally, they don't produce chromatic aberrations, so I don't think collimation is the issue.
Here is a publication by Mike Lockwood that explains how to evaluate your collimation using a bright star. It should be fairly easy to tell if your collimation is very far out of alignment by looking at the diffraction rings produced by a star. They should be concentric and should look like the picture in the publication. The nice thing about using a star for collimation is that there is no error in the diffraction rings at all.
I wouldn't be surprised if there is some CA in your corrector, or the eyepiece(s) you're using. If you look at the wikipedia description for your design you can see it's intended to be an entry level telescope, and will naturally have some limitations.
Glad to hear you're happy with the views of Saturn and Jupiter and welcome to CN.