I’m not an experienced grower - so please don’t take my word on this, just trying to help... I am also growing auto flowers (6 currently) and I’ve done my homework-ish, as it’s my first grow.
i read the optimal light schedule for auto flowers is 20 hours light 4 hours darkness.. but looking at your plants I wouldn’t have said anything looks wrong with them, just need more time to finish... the leaves look healthy, there’s nothing I can see which alarms me..if it was my plant I wouldn’t be overly concerned, it’s just not finished. The smell and bud growth will continue...
The first things you'll want to keep an eye out for are your flower's pistils. These long, hair-like organs on the surface of the bud usually start out whitish-green and darken to brown and red as time goes on. For maximum THC you'll want to harvest when around 60%-70% of your plant's pistils have darkened and started to curl in on themselves. If you wait a touch longer, until 70%-90% of the pistils have begun to curl, your buds will be lower in THC, but more abundant in other cannabinoids, which makes the bud more likely to give you the munchies and lock you onto the couch for hours. If you're growing a sativa, you'll want to harvest at the 60%-70% mark, but if you're hoping to collect an strong Indica, waiting a bit can enhance what we traditionally think of as 'Indica' effects.
I’d give the plant more time, and watch out for when it’s ready to harvest. Hope this helped!