See https://help.researchgate.net/hc/en-us/articles/14293139566353-Journals for explanations. - In case of a missing journal in RG's database, I add the bibliographic data to the abstract field (like, e.g., in https://www.researchgate.net/publication/344474227 and https://www.researchgate.net/publication/268925009).
Dear Evgeny Tretyakov Not entirely sure what you mean. Looking at for example
https://www.researchgate.net/publication/378835115_A_Review_on_the_Effect_of_Metal_Oxide_Nanoparticles_on_Tribological_Properties_of_Biolubricants I see that the journal title etc. is perfectly fine indicated.
I presume you mean your paper Article Adamantyl-Substituted Aminoxyls
According to https://pubs.acs.org/doi/10.1021/acsomega.5c00505 the paper is in the ASAP stage so no issue nr etc. info is available yet.
It would not surprise me that when the final indexing in the journal is finalized that this version is automatically uploaded here on RG (but not entirely sure).
There are journals (too small, too specialised, too new, etc.) that are not listed in the RG database, see the link provided by Wolfgang R. Dick As far as I can see this is not the case for the (very fine) journal ACS Omega.