Wall Level 9 --> level 10 issue?

[clashpimpnj]

I just did a test. Set my minimum gold to keep to 2,000,000. The bot skipped wall upgrades until it hit 6,000,000 - The code of the bot is calculating level 10 walls as 4,000,000 per upgrade vs 2,000,000 per upgrade. Hence why it waited till 6,000,000 to upgrade a piece.