Timer is Messed Up!Did I mess my Plants Up?

Hello everyone, i had a problem with my mechanical timer this morning, and also tell me if this is possible, on the timer there's 2 pins, on for the OFF and one for the ON. Lights turn on at 8PM and turn off at 8AM (12/12) the plants are in their 5th week of flower now and i woke up today to find that the lights were still ON???? somehow the on switch slid from 8PM to 10AM could this happen if the pin wasn't screwed tight enough?? is this a common thing??? i had them on there pretty tight. So the lights turned back on around 10AM (2 hours after turning off) and i found this out around 1PM. So they were on for about 3 hours. Will this affect my plants in anyway? i have not had one problem like this at all till today. Let me know the effects of this. Thanks!!!
 
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