So on my server when one clan requested to ally another clan the requests get sent continuously until a restart of the server happens, wether the request was denied or accepted
I am unsure whats causing this and hoping someone can help me figure it out :D

I have same isuue. I find out that plugin continue to send requests because it can't recodnize your unswer.. After typing /accept if player quits server, plugin notifies that "player" has signed off. CREATE_ALLY request cancelled... So plugin didn't recodnize player's unswer in first place. Spam can be disabled by changing
ask-frequency-secs: 60
to
ask-frequency-secs: -1

Looks like fixed in latest version on Jenkins