why TVAE synthesizer introduce non numerical values in some columns?

[alextopology]

Environment Details

Please indicate the following details about the environment in which you found the bug:

• DeepEcho version:1.5.0
• Python version:3.10.2
• Operating System:linux, ubuntu 22 04

Error Description

Paste the command(s) you ran and the output.
If there was a crash, please include the traceback here.