Updating from 19.12 through 21.06 could cause the event linking Inputs to be renamed. There is a developement build to correct this and will be release in the September release. This is contained to Axis A8027 cameras with relay inputs. The relays will work but the names of the inputs in event linking will be renamed. Rolling back to 19.12 Server will correct this. If this is the case please update to Dev build or our September release.
Reference build:
​https://crm.exacq.com/release/Vision%20Server/21.06.x/21.06.x/exacqVisionServer_21.06.114.0_x64.exe