Yes, it could be burning from over feeding, For autos, half strength fertilizers is plenty strong enough. If growing in soil, feed only every 10-12 days, this is all that is required. And yes, no diary = little information to go on.

A diary could be helpful to see the entire growth process and thus deduce your problem. To make accurate statements, some background information is missing. So, on what substrate are you growing, what nutrients are you feeding at what dosage? What are your pH and EC values? Maybe some pictures in neutral light as well =D Are your babies still in the growth stage or have you already initiated flowering? Perhaps a few neutral pictures as well, not too much purple, and I'm sure you'll get help quickly :)