My guess is that the “/” for the decimal is throwing things off. Tally doesn’t accept “/” in the numbers, which is why rounding to 4 might work, but entering something (and having the decimal switching to “/” ) might break things.
The “/” is unusual. I’m assuming that’s an error either with the tally install or with it working with Revit 2024. Revit 2024 had some major changes to the system that weren’t well coordinated with many of the 3rd party programs, and I wonder if this is an example of that. you might want to reach out to Tally support: support@choosetally.com