SUMA: packages "kept back", but installed on other systems

Hi, my journey evaluating SUMA continues …

I have some ubuntu 22.04 servers. I onboarded two of them in SUMA, others are yet outside of SUMA.
There are three packages that won’t get updated through SUMA and listed as “kept back”, although the same packages coming from canonical are installed on other systems.
Why would SuSE keep back some packages that the producer does not?
How do I solve this?

Thanks for advice