Y axis move button not working

[CyledTheRadioactive]

What are you trying to do, and what do you expect to happen?

I was creating a Luffy model but i cant move the body upwards.

What happens instead?

Can't move a part upwards or downwards

Model format in which the issue occurs

Json

Blockbench variant

Website

Blockbench version

I dont know which version

Operating System

What is this?

Installed Blockbench plugins

I installed some plugins

[JannisX11]

You can find the version number in Help > About.
Json is a file format, not a model format. Some formats have size limits, that's probably what you are seeing.