The map section's size filter doesn't seem entirely intuitive to me. "Small" somehow comes after "XL", and "T" presumably stands for "Tiny", which is even smaller, yet it appears right before "I", which is supposedly the largest.
I would arrange them in a list from smallest to largest, each size on its own line. Or alternatively, add a note indicating how many tiles it is, like in the map editor when creating a new map.
Good suggestion.
I've already updated the filters — they are now sorted where possible, and if a game filter is selected, a tooltip with sizes is shown (since sizes vary without a game selected).