Don't understand new full genome results from MyHeritage

So on MyHeritage, my parents and myself have Ancestry test results and also the new MH full genome test results loaded.

We see some new matches on MH from the new MH test, which makes sense because the MH test looks at more DNA. So if Ancestry never checked a certain segment, and MH does check it, new matches can pop up.

My daughter, who took only the Ancestry test, comes up as a match for me in the MH results, but with different centimorgan numbers. When I started looking around at relatives I know who did not take a MH test either, I see their results as having different values on my MH list. How is that possible? Ancestry provided a certain value, how would the MH test pull up more centimorgans for those people and change the "rankings" in my matches?

I also have a new match from the MH test with 53.1 cM. This person does not match either of my parents on their MH test results. Are the MH scans not picking up on some matches? Of my biggest matches on MH test, they all show up on one of my parent's results except for this person.

I appreciate any insights.