I assume it's the top of the T that's in question, as the others look okay. If you heat the pipe first, then then gently flick the flame onto the top of the T, then you should be fine. Do you have any pieces of lead that you can put on the bottom of the other legs to act as a heatsink, or do you have a heatpad to protect the bottom joints.
There's a nifty product called Cool Gel that's designed for that sort of thing (forgot about it earlier) but you have to be careful where you spray it, as it completely kills any heat wherever you put it. Best sometimes to spread it on with your finger - which you have to do after it blocks the nozzle when you don't use it for some time.
I reckon the joints okay. If the gap was wider, I'd be worried, but it does go down about 8mm, so should have flowed together lower down.
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