Box Checking Issues

I,ve been playing with this baby for week now and before buying i want to master it .Today i've encountered a issues on webs signup when i want to check the terms and conditions box it says success but in reality it doesn't check it.I've tried focusing first then clicking, mouse emulation with sleep time,focusing and enter. Could you please help me ?

By the way this is a great software and i hope to see it updated

webs.com/Signup (button page " I Agree To The Terms of Service")

I've tried the macro that i've created on another pc that i have bot chief and it seems that it work's.I don't understand why on the first one does not work at all because the software seems to do his job and does not give me a fail message.

Thank you !