I get this too, but only when switching from Warlock to Titan. My Hunter doesn't get it at all.
What I find weirder is that the Grimoire score is not consistent between all my characters. My Warlock is the highest at 4890, while my Titan is sitting at 4875 and my Hunter is at 4850. It seems Grimoirse score from dormant SIVA clusters doesn't carry over between characters
English
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Since the intro of RoI they created different grimoire scores per character. Mainly for items that need to be picked up like the siva clusters. I believe it's on purpose.
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This only happens with the SIVA Clusters; Calcified Fragments are unaffected. I get the feeling that this was not intentional, but is so minor that there's no urgency to fix it.