JACK Timecode runs too slowly

This is sort of an odd issue I have not been able to nail down for a while. I could not figure out why tracks that I recorded in Ardour through JACK and my audio interface always came out wayy too fast when I exported the finished project. I noticed today while having the same issue that it appears that the clock in JACK (and consequently Ardour) runs slow; i.e. one second takes probably closer to two seconds to pass. I am not sure how to fix this, though. I hope that I can salvage my projects that were recorded using this wrong timing, because I can’t get them out any other way unless I played them back in Ardour to an analog deck outside the computer. Anyway, how do I fix this?