Localhost - Snapshot runs just and only once per a snapshot

Hi I have the Snapshot Pro installed at localhost for quickly deploying on an online website and I have discovered that Snapshot Pro runs only once per instance of snapshot... How to fix it? I would love to click on "run now" but it writes "snapshot is scheduled but it is never created...

1. Add new Snapshot (I create a snapshot) + run immediately -> everything is alright
2. Run a snapshot (the same as at the step 1) -> snapshot is scheduled but never created
=> I need to create a new snapshot and run it immediately