Follow up note in Sent folder replicates dozens of times into my To Do list

Dear Ceptara Support Team,

when I sent a message and flag it for follow-up in the Sent folder (because I forgot to flag it as such upon sending), the plugin does what I expect it to do: it creates an Action Request follow up task ... however, it does it dozens and dozens of times (which I would need to delete later).

Advise please.

Thanks.