Hi Radisa, thanks for reaching out. Currently, Clay doesn't allow sending data when upstream cells are stale - this is by design to protect data integrity. The only workaround is to copy the stale values into a new basic column (manual entry type) and reference that column instead in your Send Table Data action. We've shared feedback with our product team about adding an option to bypass stale warnings for cases where you intentionally want to work with existing data.
Thanks for reporting this and sorry for the inconvenience here!