Trouble at refreshing databases

Hello, is anyone having problems refreshing googlesheets databases?
I do it and Looker tells me that all the variables in the database have
missing information and detects them as new, at the same time.
If I go on, all the graphs crash and I have to introduce the variables
again from zero.
It is happening in every dashboard that my team is using.
 
Do you know how can it be fixed?Capture.JPG
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