Mining Mission - blast out x tonnes of y unable to drop off

Quick query for people. I have mission to blast out 30 tonnes of lithium hydroxide. I'm in the cobra and mining the old way with prospectors and mining lasers.
The mission detail say i need mining laser and refinery. After getting 8 tonnes, i headed back to 'drop off'.

But the mission isn't showing on the list and looking at the details of the mission, it has the 'required cargo space' showing in red.
I've got enough space 32 tonnes, so how come I can't drop off the cargo. I'm probably missing something obvious, what though?
 
Oh... rats. Thanks. I've also got an 8 tonnes mission as well, that shows as red. So I'll finish off this round of mining and see if I can complete that.
 
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