Have been running the script myself without problems... strange that this is happening all of a sudden to you.
If anything, sounds like an issue with the OSBot interaction methods. The script (like every other on this site) uses the client's interaction system since it would be silly (&unrealistic)for every script to separately handle mouse x/y vector calculations, raycasting etc individually. Unfortunately, as a result, there is nothing that I can do to directly fix this since I do not have access to the code that is running while the interaction takes place. If this happens again (or regularly) let me know and I can try and re-create it and file a bug report, but my guess is that this was an isolated situation since it hasn't cropped up before in the ~2-3 years that the script has been live. Perhaps for now try running in quieter cooking areas, or when there are less people around? I'm not really sure what else to suggest and i'm sorry that you're experiencing this! Also, maybe re-download OSBot. Worth a shot I guess.
Cheers
Apa