Calendar in line edits not sticking

Today I’m having issues with inline edits to calendar records. When the modal is open it appears that the edits don’t stick but when the page is refreshed its clear that they were logged correctly.

https://drive.google.com/file/d/12WvCJO4C_cgT1gs2jOkUitoEBcHexHtV/view?usp=sharing