Install loop on my project

I have imported a Node.js (Express, Vue, etc.) project I’m working on to Glitch for testing, but every time I return to the project it begins installing the dependencies again. Following the install loop advice, I requested Node 14 for my project (by including "engines": { "node": "14.x" } in my package.json manifest, and then ran enable-npm from the project console, at which point the project install began again. When I returned to the project later, Glitch began installing the project again.

Can someone help me understand why Glitch decides to reinstall dependencies, and what I can do to bring this process under control?