Following people via lots of open tabs causes issues

This relates to the web UI so let me know if there's a more appropriate venue for this issue and I'll repost it.

I wanted to follow a lot of the people I know from twitter, so I looked in the "following" sections of several of my existing follows. I opened a new tab for each of the ones I wanted to follow.

(Via the client-encrypted PGP key) I clicked follow on each one in turn. As such there were several signatures being generated at once.

I'm guessing the system signs this as "following number #" because the ones that succeeded threw out the numbering for the ones in progress and caused errors, and the error message contained something about "expected number n got number n + m"

Reproduce this in the web UI by opening several follow actions in separate tabs with a client-encrypted PGP key. Trace the follow and signing flow to identify why concurrent actions produce an “expected number” versus “got number” error; done means multiple follows complete without numbering errors.

Written by the indexing model from the issue text.