When the machine applies tension it is taking a single measurement and comparing that to the anchor point locations stored in the .yaml file and checking to make sure that the measurement that it just took is a valid solution for those anchor points. If the numbers don’t match up it won’t proceed as a “something is off, let’s not go any further” safety catch.
There is a bug in that process which was that the calculation was not taking into account the z-axis height which has been fixed in the latest version which is to be released hopefully next week. You can find a test version of it here: Interstitial Firmware Releases - #585 by bar