My iPad keep automatically adding a dictionary even when I delete them repeatedly

I am using my iPad Mini (6th generation: iOS 15.0.2) to read articles online. I like the look up function very much. However, I realized that somehow my iPad keeps randomly adding a Spanish dictionary. This may have started once I tried to install the Spanish dictionary awhile back. After that, even after I delete the Spanish dictionary, I still keep seeing the Spanish dictionary entry lookup. This is quite annoying because I no longer need the Spanish dictionary and I just want to see an English dictionary. I would appreciate it if I could learn why dictionaries that I delete will come back as installed dictionaries.