I needed more detail in this barrel that I made from flat plane and using curve modifier to bend it, but when I add more cutts they are ignored when bending and the shape stays the same as if they were not there. Also when I fast created new model it works just as expected and I have no idea why on my original model they are not working. There is also a problem with both of them creating these vertical distortions when shade smoothing.
.blend if needed: https://drive.google.com/drive/folders/1I_9nzNFiBAv7eToh8vH_j0HR5IoTEW5d?usp=sharing