Board Game Arena

I was playing this game https://boardgamearena.com/6/akropolis?table=394926280 and I noticed that my opponent seemed to have a mis-scored count of blue houses. My opponent has two groups of adjacent blue tiles, one on a level 3 next to another on a level 2 (for 5 total) and then another group with one on a level 2 next to two others on level 1 (for a total of 4). The site is calculating his blue tile bonus as 1x4 rather than 1x5, is this a bug or intentional based on the rules? The rules say "largest group of adjacent houses", does that mean that because the second group is larger (3 tiles rather than 2 tiles) it is counted, even though the smaller group is worth more?

It doesn't judge based on value, it judges based on total number of tiles in the group, regardless of level.

Yep, no bug here