Looked in the data logs and found why it was happening, here are the logs:
[WRN 14:02:15.749] [Debug] Launch location Invalid not registered!
[WRN 14:02:15.758] No "" Action Bound on UIAction_Void_Button "KSP2DialogButton(Clone)"
[ERR 14:02:15.761] [Debug] [SaveLoadManager]: IsBusy: Cannot save or load, save already in progress.
[ERR 14:02:15.762] [Debug] SaveLoadManager.TriggerFailure(): Called with failure code = Error_BusySaving!!!
You can launch because it doesn't know there is a selected pad, and it cant save because it seems it is in some sort of quick save loop