Timer resets to 24 hours upon completion

[tealish]

The timer on this app automatically resets to 24 hours after it has finished the designated time. This has happened twice out of the 5-6 times I have used this program.

[PhilippFS]

Same Problem here. Win 8.1, x64.

[bigchipbag]

Had this happen today - but I noticed it was counting down time weirdly though before it hit zero (often two seconds would come off at once, or it would count down really fast). I would assume they could be related