RM125 Rm 125 rear wheel don't fit

Hi guys , so I have removed my rear wheel on my rm125 to change the tyre , I have came to put the wheel back on and the axle will only go through to the rear brake caliper bracket and them gets stuck and won't go any further. I have tried to give it a little persuasion but still will not budge any more , any suggestions as to what might be the cause or came across this before? Any suggestions would be great as I am stumped right now
 
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