Model Tags in Thingworx 7.3

I have installed Thingworx 7.3 on a laptop with Windows 10. In the Applications under Model Tags, there is an issue. I added a term in the Applications Vocabulary and later wanted to edit it, which is not possible, instead what I had to is delete the term and add a new term in place of it. But before doing this I had removed all the tags of that term from all the entities tagged with it. Still the tag persists in the tagging option of the entities, even though it is neither visible in the vocabulary nor is it visible from the REST API.