That is odd.
- Is it possible that you have two versions of the template in your spreadsheet (perhaps an old one that is hidden)?
- Or maybe the Tiller Money Labs add-on is having trouble writing the version metadata into the sheet?
There is no harm in deleting the current one (version 1.10) and then adding version 2.05 using the Add Solution workflow. (If you delete the one you have tried updating and the add-on still thinks the template is installed, that is a good indication that there is a hidden copy in your spreadsheet.)