reverse order vs First message in mailbox does not match fir

[jkbzh]

Just installed hypermail 2.3.0 on Linux. Was using 2.1.4.
Whenever I run hypermail on an mbox, it gives me this:
First message in mailbox does not match first message in archive or obsolete gdbm file present.
Not using gdbm.
After checking a few things out, my hypothesis is this: I run it with reverse=1, so the most recent email appears at the top of the index.html page. This is opposite to the mailbox, where the most recent email is at the end of the file. (But the oldest email archive is 0000.html.)
Could this be what is going on here? If so, what do you suggest?
Thank you,
Ron

Reported by: *anonymous

[gnadelwartz]

same issue here, I also get this message with reverse. When using gdbm its gone.