You can inspect the face but you cannot sync those changes to your watch or save them. This is an obbvious precaution.Only fully published faces, or your own draft faces can be synced to your watch.
The only thing you can do is try and create a similar watch with the same elements yourself, find out what might be wrong and make one of your own and report the error to the creator.
There have been lots of instances reported of facer watches not completely working with Galaxy 4 watches and it is possibly due to the fact that they are new and the only watches to have Wear OS 3. The watch Developer would hopefully be greatful for your feedback and, if a paid developer, will work closely woth facer to resolve this.
This is not a paid developer but if you describe the error you are seing then maybe other folks here who have a Galaxy 4 might be able to help @milton_hoyos resolve the issue as there are often discrepencies between what is seen in the creator and view modes versus various watches themselves.