One of my books appears 5 times on ResearchGate. Why I cannot merge the 5 on ResearchGate? Solutions?

I can merge 5 items on Google Scholar and on ORCID. But I cannot merge multiple items on ResearchGate.

I can delete 4 items out of 5, to remain with 1 item, but then I lose the reads of the 4 deleted and I also waste the associated score of interest on ResearchGate.

Why I have 5 items for the same book? Because multiple authors of this collective books shared it and ResearchGate asked me to confirm my authorship. Which I did. But now I would like to merge them on ResearchGate, the same way I can do on ORCID and Google Scholar. Do you know any solutions, please?