Word count keeps changing

I recently upgraded to Scrivener 3 on Windows and have a project with a couple of chapters and several text files. One file in particular has over 1,000 words. My computer periodically updates and turns off/on, and when it does and I check that particular file the count at the bottom now reads about 300 words. If I create a new text file and copy/paste the original text into the new file the word count is then correct. Any thoughts on what’s going on/how I can resolve this?