Sorry for the trouble! The most common cause of something like this is when the same repeating action is checked off on two different devices that are out of sync.
They each create a next iteration of the action; when they sync up, each device gets the one from the other device. There is something that can help prevent this: when switching devices, sync the one you're switching away from, then the one you're switching to. It leaves less room for this kind of thing to happen.
If that doesn't sound like what you're seeing, please contact our
support ninjas; with a copy of your database and some info on which tasks are the ones that look wrong to you, we can try and figure out what happened and get it fixed if it's a bug.