Hi,  I'll try and explain it better. 
The community  budget has been calculated over a 15 month period  and not the usual 12, so it was  from October 2014 to December 2015, you have already paid October 2014 payment,  so your 2015 payments are taken on the same as dates as usual January, April, July and October I think it's the 15th of each month. 
 
 
Thanks 
Richard