keys file spammed by fluxbox-update_configs

I just found my ~/.fluxbox/keys has grown to 121022 words in 1.1MB (original 852 words)!

The culprit seems to be fluxbox-update_configs, which has added countless lines, marked:

    ! fluxbox-update_configs added '(workspace=[current])' to (Next|Prev)(Window|Group)
    ! check lines marked by 'FBCV13' if they are correctly updated

(977 times - also added '(workspace=[current])' and '!! FBCV13' to the config line in question)

and

    !mouse actions added by fluxbox-update_configs
    OnTitlebar Mouse1 :MacroCmd {Focus} {Raise} {ActivateTab}
    !mouse actions added by fluxbox-update_configs
    OnTitlebar Move1 :StartMoving
    OnLeftGrip Move1 :StartResizing bottomleft
    OnRightGrip Move1 :StartResizing bottomright
    OnWindowBorder Move1 :StartMoving

(5862 times! holy crap!)

I don't have fluxbox-update_configs anywhere in my autostart files, and i remember executing it manually maybe twice the whole time i'm using fluxbox, maybe once since i last looked at keys.
I just tried to reproduce, but nothing changes when i run fluxbox-update_configs.

I searched the mailing lists and only came up with this:
https://sourceforge.net/p/fluxbox/mailman/message/27087416/
I searched the bugs on sourceforge and only found this:
https://sourceforge.net/p/fluxbox/bugs/1020/ (their keys file looks somewhat similar but nowhere near as large as mine)

Any ideas?

Greetings,

danter

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