Hi @rsak-384,
I think the issue is likely in the database. There's often a discrepancy between the different taxonomic databases, so depending on where you're pulling that information, there may be a difference. There was also a major update to either Silva 132 or 138 to incorperate the GTDB naming scheme, which shook things up. I would check the Silva release notes to be sure when GTDB was included.
I would personally recommend caution in manual curation without making it very clear how and why you've made changes, just for the sake of future reprooducibility.
Best,
Justine