i assume its something to do with the scale export? but i have tried messing around with the setting but nothing happens has anyone experienced this who can help ?
This sounds like a bug in Blender’s FBX importer or exporter. It’s pretty common to see scaling changes with FBX, so tweaking those settings related to scale and units might help. But ultimately it’s a proprietary format that Blender had to reverse engineer to implement at all. We tend to advise using glTF files with three.js when you can.
It might also be worth trying the “Better” FBX importer/exporter, I haven’t used it but people seem to agree it’s better: