"the truce is no longer binding"

[batguydevil]

i had a NAP with the north on static wars and after a while i realised the number of NAP days weren't decreasing on my faction screen so i assumed it was because i was on static. so, i change to normal wars and after about two months i check again and it says "The Iron Empire(i own the faction) is bound by truce not to attack The North. However, this truce is no longer binding to The North. The truce will expire in 40 days." so the days didnt at all go down and the truce is no longer binding on the north but is binding on me?? what kind of bullshittery..  i may sound like a idiot if this is a clearly known bug or a known feature that i wasnt aware of lol i hope you'll forgive me