@Sergey, you are looking at the version number of two different meta packages. One is providing the 4.13 kernel in the Xenial release and the other the 4.13 kernel within the Artful release. The more important part is that you are *running* the right kernel (uname -a). The output should contain 4.13.0-38 in both cases. The base of the HWE kernel in Xenial is the Artful kernel, so the patches are applied to both.
@Sergey, you are looking at the version number of two different meta packages. One is providing the 4.13 kernel in the Xenial release and the other the 4.13 kernel within the Artful release. The more important part is that you are *running* the right kernel (uname -a). The output should contain 4.13.0-38 in both cases. The base of the HWE kernel in Xenial is the Artful kernel, so the patches are applied to both.