necesito ayuda con land uses fee

[Riojano Kappler]

hola veras tengo dos terrenos uno de 512 metros  cedido a grupo como contribucion y otro de 16384 igual cedido al grupo como  contribucion pero voy a mi land uses fee y me sale esto que no comprendo muy bien 

Square meters owned: 0 Square meters donated: 15361 Premium Bonus in Square Meters: 512

512

Paid Tier Level: 16384

16384

Available Square Meters: 1535

1535

y queria saber  por que me aparecen menos metros donados y  que significa ese availible square meters

 

Hello really I have two grounds one of 512 metres given to group as a contribution and another 16384 as ceded to the group as a contribution but I am going to my land use fee and I get what I do not understand very well Square meters owned: 0 Square meters donated: 15361 Premium Bonus in Square Meters: 512 Paid Tier Level: 16384 Available Square Meters: 1535 and I wanted to know that appear me less donated meters and which means that availible square meters