Modern chainrings are like partly worn out old style chainrings

[ReapThaWhirlwind]

This is most likely due to being cross-chained. You would have to re-adjust your indexing, or the spacing in your BB (if possible); or the dishing of axle (created by the size and displacement of the spacers and locknuts you're using).

Another common source of this is the b-screw not being tuned properly.

Some cross-chaining can't be helped depending on your setup and the components you have to work with. This is a very common issue for single speed converts using conversion kits. This can cause a clinking sound now and again from the chain being forced back onto the sprocket. If you're using 3/32 chainrings and spockets, then using a wider chain (such as a single speed 1/8" chain) can help in some cases. That design you posted could be (in-part) to help adhesion in this case also. It helps adhere the chain to the chainring—also reducing friction slightly.

Saw a few posts on Reddit recently of similar issues, one was due to their pulley being worn out (maybe their chain too), and another because their derailleur wasn't routed correctly.