Do you have a separate feed from the LNB (The bit in front of the dish) to each freesat box or is it just one lead to the lounge box and looped through to the bedroom?
If they are separate then check the lead and connections to the bedroom box. You only need one stray strand of the braiding to short and attenuate the signal.
If you just have the one lead down from the dish then the second box is going to suffer a bit. Either get a second lead if the LNB has a twin or quad feed
or, if not you may need some sort of satellite signal distribution amplifier.
The dish alignment should be ok as the lounge reception is spot on.
Check and double check all the connections.
Yours aye
Ned