My best estimate is that the impact factor algorithm has been altered possibly with a weighting added according to the journal and almost certainly with a weighting introduced in respect of authorship. This been discussed with some insight and a little humour within the link I give below.

If we could find out exactly what had been altered/added then maybe we could consider whether or not the adjusted impact factor algorithm actually provides an improved measure of impact. Clearly, the aim should be to generate a more effective measure.

https://www.researchgate.net/post/What_happens_with_impact_factor_in_RG

Dear Malcom.

I have sent a message to RG Community Support and here is its answer:

Dear Montserrat,

Thanks for getting in touch. We've been experiencing some technical issues that should be fixed soon. Please accept our apologies for the inconvenience, and thank you for your patience.

I guess we have to wait...

Thank you for your explanation.

Kind regards!