Memory issue on Shiny app

I'm fairly new to Shiny and and having some issues deploying an app on shinyapps.io and am getting a code 137 error (not enough memory). I have size set to large, which I understand gives me 1 GB, and I wouldn't have expected the app to have such issues with memory as it only includes a couple calculated functions and three interactive tabs.

My code is stored here - does anything stand out as an obvious cause of a memory leak (?) or any other problem which is causing the app to crash?

I apologize if I'm not providing the right amount of information or phrasing things incorrectly - first time in the community. Let me know what else I can provide if it's helpful.

Not sure why, but just re-uploaded the app and seems to work fine now.

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