In the 10k tools on Meta, the posts that show having undelete votes have a count showing that is off by 1. Some of these have no undelete votes showing on the post, so it's not a caching issue.
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There are two things you are seeing here.
For the questions that have higher shown on the question than shown in the tools, this is because you're only looking at a time-based filter in the tools. The one with 2 undelete votes, if you look at the 30 day view it shows 3 undelete votes. Undelete votes age away much slower than other votes, if at all.
For the questions that are reported as having 1 undelete vote on the tools, but don't show any on the question, this is because both of them have been undeleted successfully, and were simply re-deleted afterwards. Like close votes, solidified undeletion/deletion votes retain their count even after the choice has been reversed.