Make sure that you have the latest versions and also make sure that the SIP is not causing the problem. You can disable SIP by setting the CsrActiveConfig to 0x67 in your config.plist under the Rt Variables or try disabling it from the clover boot menu option by choosing the System Parameters and then System Integrity Protection.
Which SMBIOS do you use?
i tested root/i386/booter. i mistook it and not consider specific folder name.
i see. booter files is located in user's specific folder name "Netinstall de Installer macOS High Sierra.nbi" like you mentioned.
it's hard. it's not strict.
if user use folder name only "Netinstall de Installer macOS High Sierra.nbi", Clover can detect it. but if there are cases like this
"macOS High Sierra.nbi", "Netinstall Installer macOS High Sierra.nbi". etc, can't detect.
also your lang not english. there are so many cases. can't consider only your lang.