Vufori Model Target issue NOT Appearing

Hello guys and girls!

A few days ago i managed to use the model target to recognise my real life prop, I 3d modelled something similar and it worked!

The goal was to use a real life prop, 3d model it to match up, once recognised play a 3d animation, which is what i achieved until now (it worked way more than once in case you're thinking it is by luck)..

Now the issue is a few days later it stopped working, the weird thing is, In vuforia when something is recognised my camera makes a slight blur flash effect as to say it has recognised my prop but the 3d animation no longer appears on the screen?!

the 3d animation and model work fine when not attatched to the model target but all this worked a few days ago, so why has it all stopped?

I did consider lighting but no, i attempted multiple things but cant seem to get it to work any longer. has anyone else experience this whole thing?

I tried doing it all again in another project and nothing..

Any ideas?