This has been happening several times a day where a column I have designated for text input changes itself to a date field. I have data being input by form users to rows. They go to use the form and are presented with a date field where they are supposed to be inputing several sentences of text for their daily report. I go in and manually change the field type back to Text/Number so they can use the form (several times per day)
I've contacted SmartSheet tech support.