Join or collect function changing date format

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Hello all,

I've made a formula using JOIN(COLLECT()) to generate the date of completion for a certain type of task (a date entered in a different smartsheet) based on the project number for that row. The column property for both the range referenced and the column the formula is in are set as Date columns, with a DD-MMM-YYYY format for both using the calendar button in the upper right. But for some reason the formula shows the date in this format (MM/DD/YY), which leads to a NETDAYS formula giving an #INVALID DATA TYPE error.

Neither the format nor the NETDAYS formula have a problem when I manually link the cell to the specific reference I want, but that's time-consuming and increasingly impractical. If anyone has any insight I'd be very grateful.

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